I don’t assume anything. Nor do I hold onto the Bible as if this was something I started with. Frankly, YOU are the one holding onto something which makes no sense to you and refusing to let go. I wasn’t raised Christian, but rather in the most liberal family imaginable. Both of my parents were non-theist psychology majors – so psychology is the closest thing to a religion in which I was raised.
Thus my starting point for truth is science, so much so, it is part of the way I see the world and anything contrary to its findings is not worth consideration for rational belief. I am a scientist (masters of physics from the university), and remain so before I am a Christian. And where you may have been raised in an anti-rational sector of Christianity to think that science and Christianity are mutually exclusive, this has never been the case in the rest of Christianity.
So my “creation account” is that of the Big bang and I have no reason whatsoever to discard this. As for your question about why believe in God, I do not see a sincere inquiry there, but only incredulity that anyone could possibly come to a different rational conclusion than you do. But while you revel in a worldview (much like your old one) where you are privileged to know the truth unlike all those poor deluded suckers our there, I have a worldview which does not look at other people that way… frankly rather consistent with the way I was raised, to view with contempt the ugly arrogant westerner looking down their noses at all the primitives of the world.
Biologos is a gathering of Christians (even evangelicals) who see value in both Christianity and evolution. So I came here rather tired of pointless talks with creationists. But despite evolution providing you with the excuses you need to discard a rather noxious form of Christianity there is no fundamental conflict within the full spectrum of Christians belief and that is why the majority of Christians accept evolution.
I certainly hope that the requirements of those who have turned a belief in God into a tool for power and manipulation is eventually removed from all of Christianity.