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Everyone needs to know how corrupting religion can be.
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Yes, there are issues with religion, but not everyone who is religious is automatically a bad person. These people were trying to be nice to you in their own way, even if you don't agree with it. I don't think what they said was necessarily right either, but they are not trying to be mean to you, while you are being completely rude to them. You don't have to agree with them, swearing at them in capslock and calling them names is not the way to respond. They wouldn't have even said anything to you in the first place if your signature wasn't so confrontational.
As others have said, there is a difference between "I am religious" VS "Atheism makes people evil" the same way there is a difference between "I am an atheist" VS "Religion makes people evil." We encourage everyone to believe whatever they choose, but anyone who tries and force their beliefs down other peoples' throats, whether they are religious OR atheist, is plain unacceptable.
If you want to debate this, go to the Debate forum instead of personally attacking people. Enough is enough.