Well, the only possible way that I could find out 100% certain that theistic evolution is true is if God tells me Himself--which can only happen after I die. I won't walk away from the faith in that case.
So you don't see the problem with reconciling theistic evolution with Scripture?
In order for theistic evolution to be true it would (among other things) mean that the description of how God created man in Scripture would need to be rejected. This is especially significant considering that the literal understanding of creation (especially of Adam and Eve) play a big part in understand other essential doctrines of the Christian faith. In other words if we find out theistic evolution is true; we would need to adjust our understanding of other doctrines.
Also, based on what I have read about what "theistic evolutionists believe. They reject a literal Adam and Eve, in favor of other theories because a literal Adam and Eve do not fit with the Scripture narrative.
Basically the only difference between evolutionists and theistic evolutionists is theistic evolutionists believe God directed evolution.
They start with accepting evolution as fact and try to make Scripture fit with it. This is bad hermeneutics.