And it seems that each individual christian has their own version of christianity.
It might seem that way, but it really isn't. Thousands of different denominations really doesn't mean a lot. Generally speaking denominational differences are so minute they are hard to distinguish.
To their followers they're hardly minute. If they were so insignificant we wouldn't see so many break away religions, starting with protestanism, would we?
Go ahead and tell a Southern Baptist that his religion is only minutely different from the ORIGINAL christianty - you know, the one practiced by Catholics. Try find telling a Mormon that he follows the same religion as a Lutheran. Tell a 7th Day Adventist that their religion is just like going to a Methodist church.