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Don't see the point of a religion where you can pick and choose the bits you like and don't like. It's bloody Holy Pick n Mix I tell thee !!! Why not throw away the Bible/Koran etc and just say you believe in a mysterious supreme being and then make the rules up yourself
There are different types of Believers DS, there are Fundamentalists- which I would consider myself to be, I believe in the core principals of the faith, but the other subsidiary areas so to speak I don't agree with. Literalists are people like Dave who take everything they read literally, and a lot of things in the bible are written as as metaphors. Eg Adam and Eve, Dave probably believe these were two factual characters but I believe they were two fictional characters created to show how man can be tempted- its basically about adultery.
As for pick and mix religions- like I say many people will agree with the fundamental areas of the religion but the arses like gay relationships etc are not agreed on (which are not really a massive part of the church imho, as they are more to do with church practice than church beliefs) which is why the Catholic Church is so large. The likes of protestant churches, where people have doubted the fundamental aspect is why there are so many breakaway protestant churches.