I believe very differently than the OP, but I don't really see how someone stating that everyone is born Muslim is any more offensive than the doctrine of Original Sin.
Given the choice, I prefer to be told that I was a Muslim as a baby than to be told that I was born carrying a "spiritual disease" or "spiritual defect" and that only Christianity has the cure - Jesus.
Mind you, I believe that both are simply false, but I just don't understand what was said in this thread that warrants so many people ganging up on
@AdamRaja.