Anyone who leaves the church does so due to the fact that many are called but few are chosen. Those who belong to Christ are secure in Him, and no one can pluck them out of His hand. Those who love not the truth can find whatever reason for betraying Christ - we don't have to give them one.
It's not my prerogative to double down in support of anything other than the Word of God. And I do not make it my mission to go around preaching a young earth. I preach the Gospel of Jesus Christ. And those who are chosen of the Father will come to Christ, and none will be lost.
Something doesn't have to be scientifically feasible to be true. That is my contention. I am not here to say that science says this or that. I stand on the rock of God's Word. Science is not the ultimate determiner of what is true. The Bible, God's Word, is the standard for all truth. It wouldn't matter to me if science demonstrated with absolute certainty that the Bible was wrong about something - I believe God and His Word more than I believe science. If that stance is unreasonable to some, then there is a spiritual reason for that.
Where is the wise man? Where is the scribe? Where is the debater of this age? Has not God made foolish the wisdom of the world? For since in the wisdom of God the world through its wisdom did not come to know God, God was well-pleased through the foolishness of the message preached to save those who believe. For indeed Jews ask for signs, and Greeks search for wisdom; but we preach Christ crucified, to Jews a stumbling block, and to Gentiles foolishness, but to those who are the called, both Jews and Greeks, Christ the power of God and the wisdom of God. Because the foolishness of God is wiser than men, and the weakness of God is stronger than men. For consider your calling, brethren, that there were not many wise according to the flesh, not many mighty, not many noble; but God has chosen the foolish things of the world to shame the wise, and God has chosen the weak things of the world to shame the things which are strong, and the base things of the world and the despised, God has chosen, the things that are not, that He might nullify the things that are, that no man should boast before God. 1 Corinthians 1:20-29