It's not your interpretation of the bible, it's the fact that it is interpretable in so many ways that causes so many problems. Problems like the ones that lead to phrases such as "Well, they aren't real Christians".
Sometimes people don't think critically. At one time I believed that I was a true Christian. How did I know? What is a true Christian? Well at the time it was all a product of my interactions with other members of my congregation. As a youth group member one tries to live up too all the expectations of the elders, of the other youths, and of their parents. It was praise and acceptance that I was looking for. It's the praise and acceptance that everyone is looking for... granted we did have a couple of those "fuck authority" kids, always making their decisions based on how much they could piss off the powers that be (those people annoy the hell out of me too).
My congregation was made up of like-minded people who had specific ideas of what it's like to be a true Christian. Being a congregation meant that we had, for the most part, a similar frame of mind when it came to our beliefs. If someone strayed too far from these beliefs, various forms of spiritual what-not would take place (for example, a sit-down/talk with elders). If/When someone would concede irreconcilable differences they would just find a new denomination with Christians that would welcome their particular take on how "Real Christians" should operate. After finding a new place to call home they would completely disregard the illogical situation that just happened... They were part of a situation that, because of the interpretable "Word of God", they were forced to leave a group of people they once called brothers and sisters. When a preacher is giving a sermon it's called infallible, but when hard questions are asked...it becomes interpretive.
In 2000 the World Christian Database showed about 33,000 denominations of x-mas sects. Now, they only mention 9,000... however, it would still be a "WTF?!" number even if it was 2. By backing this current religious situation Christians are advocating not only the belief in an ancient book, but also that their God is incapable of writing one that is straight forward enough to unite all people. In the Christian religion one is talking about eternal punishment in hell for things that sincere God-loving/fearing people can't agree on. If these beliefs are true... Then Yaweh is a prick, unworthy of worship. I really wish Christians would spot these major flaws of interpretation and stop failing so much at life.
"This is one of the pinnacles of Christian apologetics...and they are unable to spot their flaws in their own [arguments]. Now they are bending over backwards and sacrificing every bit of decency they have in order to make excuses for this fictional monster they feel they must defend." - Matt Dillahunty (around the 30 min mark)