I am quoting from A W Pink's book on the life of Elijah. This is in chapter 14 and found it very much like the zeal Paul showed and it also stands true for us today.
Elijah made a demand for definite decision. It is to be borne in mind that Jehovah was the name by which the God of the Israelites had always been distinguished since their coming out of Egypt. Indeed, the Jehovah-God of their fathers was the God of Abraham, of Isaac, and of Jacob (Ex. 3:15, 16). "Jehovah" signifies the self-existent, omnipotent, immutable, and Eternal Being, the only God, beside whom there is none else. "If Jehovah be God, follow Him: but if Baal, then follow him." There was no "if" in the mind of the prophet: he knew full well that Jehovah was the one true and living God, but the people must be shown the untenability and absurdity of their vacillation. Religions which are diametrically opposed cannot both be right: one must be wrong, and as soon as the true is discovered, the false must be cast to the winds. The present-day application of Elijah’s demand would be this: if the Christ of Scripture be the true Saviour, then surrender to Him; if the christ of modern Christendom, then follow him. One who demands the denying of self, and another who allows the gratifying of self, cannot both be right. One who requires the uncompromising mortification of sin, and another who suffers you to trifle with it, cannot both be the Christ of God.
Note: I find here even though this was written years ago it holds so much truth for us today we must take heed of these words.
The Lord is a jealous God, demanding our whole affection, and will not accept a divided empire with Baal. You must be for Him or against Him. He will permit of no compromise. You must declare yourself. When Moses saw the people of Israel dancing around the golden calf, after destroying the idol and rebuking Aaron, he stood in the gate of the camp and said," Who is on the Lord’s side? let him come unto me" (Ex. 32:26). O my reader, if you have not already done so, resolve with godly Joshua, "But as for me and my house, we will serve the Lord" (Josh. 24:15). Ponder these solemn words of Christ: "He that is not with Me is against Me; and he that gathereth not with Me scattereth abroad" (Matthew 12:30). Nothing is so repulsive to Him as the lukewarm professor: "I would thou wert cold or hot" (Rev. 3:15)—one thing or the other. He has plainly warned us that "no man can serve two masters." Then "How long halt ye between two opinions?" Come to some decision one way or the other, for there can be no compromise between Christ and Belial.
There are some who have been brought up under the protection and sanctifying influence of a godly home. Later, they go out into the world, and are apt to be dazzled by its glittering tinsel and carried away by its apparent happiness. Their foolish hearts hanker after its attractions and pleasures. They are invited to participate, and are sneered at if they hesitate. And only too often, because they have not grace in their hearts, nor strength of mind to withstand the temptations, they are drawn aside, heeding the counsel of the ungodly and standing in the way of sinners. True, they cannot altogether forget their early training, and at times an uneasy conscience will move them to read a chapter out of the Bible and to say their prayers; and so they halt between two alternatives and vainly attempt to serve two masters. They will not cleave to God alone, relinquish all for Him and follow Him with undivided hearts. They are halters, borderers, who love and follow the world, and yet retain something of the form of godliness.
There are others who cling to an orthodox creed, yet enter into the gaieties of the world and freely indulge the lusts of the flesh. "They profess that they know God; but in works they deny Him" (Titus 1:16). They attend religious services regularly, posing as worshippers of God through the one Mediator and claiming to be indwelt by that Spirit through whose gracious operations the people of God are enabled to turn from sin and to walk in the paths of righteousness and true holiness. But if you entered their homes, you would soon have reason to doubt their pretensions. You would find no worship of God in their family circle, perhaps none, or at best a mere formal worship in private; you would hear nothing about God or His claims in their daily conversation, and see nothing in their conduct to distinguish them from respectable worldlings; yea, you would behold some things which the more decent non-professors would be ashamed of. There is such a lack of integrity and consistency in their characters as renders them offensive to God and contemptible in the eyes of men of understanding.
There are yet others who must also be classed among those who halt and hesitate, being inconstant in their position and practice. This is a less numerous class, who have been brought up in the world, amid its follies and vanities. But by affliction, the preaching of God’s Word, or some other means, they have been made sensible that they must turn to the Lord and serve Him if they are to escape the wrath to come and lay hold on eternal life. They have become dissatisfied with their worldly life, yet, being surrounded with worldly friends and relatives, they are afraid of altering their line of conduct, lest they should give offense to their godless companions and bring down upon them their scoffs and opposition. Hence they make sinful compromises, trying to conceal their better convictions but neglecting many of God’s claims upon them. Thus they halt between two opinions: what God will think of them, and what the world will think of them. They have not that firm reliance on the Lord which will lead them to break from His enemies and be out and out for Him.
There is one other class which we must mention, who, though they differ radically from those which we have described above, yet must be regarded as proper subjects to ask, "How long halt ye between two opinions?" While they are certainly to be pitied, yet they must be reproved. We refer to those who know that the Lord is to be loved and served with all the heart and in all the He commands, but for some reason or other they fail to avow themselves openly on His side. They are outwardly separated from the world, taking no part in its empty pleasures, and none can point to anything in their conduct which is contrary to the Scriptures. They honour the Sabbath day, attend regularly the means of grace, and like to be in the company of God’s people. Yet they do not publicly take their place among the followers of Christ and sit down at His table. Either they feel too unworthy to do so, or fear they might bring some reproach on His cause. But such weakness and inconsistency is wrong. If the Lord be God, follow Him as He bids, and trust Him for all needed grace.
"If Jehovah be God, follow Him; but if Baal, then follow him." The double minded man is unstable in all his ways" (James 1:8). We must be as decided in our practice as in our opinion or belief, otherwise—no matter how orthodox our creed—our profession is worthless. It was evident there could not be two supreme Gods, and therefore Elijah called upon the people to make up their minds which was really God; and as they could not possibly serve two masters, let them give their whole hearts and undivided energies to that Being whom they concluded to be the true and living God. And this is what the Holy Spirit is saying to you, my unsaved reader: weigh the one against the other—the idol you have been giving your affections unto and Him whom you have slighted; and if you are assured that the Lord Jesus Christ be "the true God" (1 John 5:20), then choose Him as your portion, surrender to Him as your Lord, cleave to Him as your all in all. The Redeemer will not be served by halves or with reserves.
"And the people answered him not a word" (v. 21): either because they were unwilling to acknowledge their guilt, and thereby offend Ahab; or because they were unable to refute Elijah, and so were ashamed of themselves. They did not know what to say. Whether convicted or confused, we know not; but certainly they were confounded—incapable of finding an error in the prophet’s reasoning. They seem to have been stunned that such alternatives should be presented to their choice, but they were neither honest enough to own their folly nor bold enough to say they had acted in compliance with the king’s command, following a multitude to do evil. They therefore sought refuge in silence, which is to be much preferred to the frivolous excuses proffered by most of such people today when they are rebuked for their evil ways. There can be little doubt but what they were awed by the searching questions of the prophet.
"And the people answered him not a word." O for that plain and faithful preaching which would so reveal to men the unreasonableness of their position, which would so expose their hypocrisy, so sweep away the cobwebs of their sophistry, which would so arraign them at the bar of their own consciences that their every objection would be silenced, and they would stand self-condemned. Alas, on every side we behold those who are seeking to serve both God and mammon, attempting to win the smile of the world and to earn the "well done" of Christ. Like Jonathan of old, they wish to retain their standing in Saul’s palace and yet keep in with David. And how many professing Christians there are in these days who can hear Christ and His people reviled, and never open their mouths in reprimand—afraid to stand up boldly for God, ashamed of Christ and His cause, though their consciences approve of the very things for which they hear the Lord’s people criticized. O guilty silence, which is likely to meet with a silent Heaven when they are pleased to cry for mercy.