But ernie is absolutely correct - any of the various subdivisions or sects of Christianity thinks that all the others are damned, exactly the same as atheists. Any sect that doesn't worship in the same way as you is heretical. Surely that's a basic point of religion that everyone must have noticed - the Crusades, etc.
I think you're wrong on all counts there, with a very few minor exceptions, which while having Abrahamic origins generally don't don't want to stand up and be counted as Christian, no matter how you might label them. Modern day Christianity is very ecumenical.
Awesomely predictable! 
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