Why would your faith be in vain? You obviously have faith that a God exists who loves, indwells and saves you, right? The Bible does not have to be infallable and inerrant for you to intuitively know such things. Whether one takes them literally or allegorically, the healing, feeding, saving, forgiving actions of Jesus recorded in Scripture proclaim God's character. Regardless of whether the miracles, quotes or other doctrinal commentary is inerrant, the picture of Jesus Christ's life speaks louder than mere words on paper. This could have been passed down through oral tradition without a book. Even better, it can be transmitted through the actions of those energized by the Spirit of Christ to be salt, light, and episitles written on the heart. A person who does not rely on an infallable book must learn to trust in God even with some uncertainties and ambiguities about life and the afterlife, simpley because of who God is. God is for us. God is with us. God saves (which is what the name Yeshuah means in Hebrew). What more do you have to know than the Gospel that the Name of Yeshuah means God Saves? Coupled with Christ-like actions springing from agape, just His Name would have been enough to evangelize throughout the centuries. It is the underlying essence of the Scriptures that matters more than the superficial substance. Faith that is moved by compassion to act like Jesus is not in vain. God is much bigger than the Bible and does not need an infallable, inerrant book to reveal Himself or his Salvation. Even if you suddely found out the Bible was not inerrant, I think you would find that your faith is not in vain. The Spirit of Christ would still testify with your spirit that you have had an encouter with a loving, merciful, benevolent, saving God.