Then surely you should be able to understand how, along with all those other religions, your particular religion is meaningless to us atheists in the exact same way.
I keep an eye on all people with faith-based beliefs, as all of them are quite capable of poisoning society with their unjustified/irrational beliefs. Some a bit more then others - depending on the number of followers as well as what exactly is being believed.
And yes, I do find that threatening to a degree. Still talking about all kinds of faith-based beliefs now - not just christians or whatever.
Take homeopathy. I consider that a real threat to health care for example.
Christianity, especially in the US, represents a real threat to the secular principles of a democracy, as well as education, if fundamentalists get elected.