Saggi. You don’t need to have ‘ knowledge’ of the Bible to be a Christian, but you do need to have been told by someone who has, what to do to be saved. That doesn’t involve reading every word, and you’re right, most Christians, myself included, have probably not read the whole book. We have been directed to the New Testament, where Jesus tells us what to do to be saved. In John 17:3 Jesus says “Now this is eternal love, that they know you, the only true God, and the one whom you have sent, Jesus Christ.”
As for evidence of a creator, just look around you. Most of it has not been constructed by man. OP, Christianity is not about a set of rules, that’s religion. It’s about the relationship with Jesus.