I Don't Know What To Call This Post

Reading a few blogs has made me think about people who don't know or believe that there IS a spiritual world or even a spiritual aspect to life. Susan asked some questions here here that tie in with questions raised in my mind from Debunking Christianity.
I spent many years believing after I first found out about God and Jesus but it wasn't a convincing belief. There were too many questions and I usually heard that if I didn't believe everything this particular way, I was being deceived. What are we to do with our rational minds? I was able to understand that some things can not be understand with our human intelligence alone but it really does sound like a "cop-out". The concept of using a different part of our understanding made sense but I couldn't do it so it wasn't real to me.
Then when God's spirit came to me, showed him/it self to me, it was a completely different perspective, nothing like I ever knew about. This time when I KNOW it's a fundamental knowing, not like I learned something, it's the BASIS. If God doesn't give that to someone, they can't have it!
On Debunking Christianity, apparently a group of ex-pastors and church people have rejected all they "knew". It makes me question what could make someone do that? What could make me do the same thing now? I question all kinds of things in religion, in the Bible, in my experiences, but I can no longer question that there IS a God. Whatever God really is. These people seem to not be rejecting God so much as rejecting that there IS a God - big difference. What happened to the God they "knew"?
How do we know how far our own responsibility goes? As humans, there's only so much we can know and do, the rest is up to Him; if not all of it. I'm waiting to find out there's a biochemical reason for spiritual belief, there have been indications I think; the guy who blogs Brain Stimulant has posted an article or two indirectly concerning this.