For many Bible-believing Christians, the Bible is sufficient. If it doesn't mention dinosaurs, then they are not an essential of the faith and we don't need to know about them
Which is as concise an answer to, "what's wrong with faith-based thinking?" as it would be possible to imagine.
It kills curiosity and investigation. It crushes a unviverse full of wonders into the confines of a Bronze Age book written by ignorant pre-scientific nomads.
My hypothesis on why there is so much atheism among ex-JWs is that for many of us it took considerable courage and critical-thinking skills to see the error in our beliefs. Many, but not all, have the fortitude to apply the same skills to belief in god and inspired boks.
E.T.A. - and what Phizzy said ^^^^^