I refuse to argue, but I'll debate it all day!

Just reply that: My beliefs are my own, as yours should be so refrain from asking !

Tell them that you never discuss religion or politics it's always sure to offend someone

the only time that ever happened to me i said "i agree with mark twain, who said (i approximate here) 'i am glad god does not exist, for if he exists, surely he is a malign thug.'" it didn't go over well. i was young. i should have said "it is against the law to ask me that" because this was my boss asking. i don't know if it is or was against the law for a coworker to ask in casual conversation, so maybe "that is personal" would be the best answer if you don't feel like sharing.

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I tell them that I don't discuss religion, politics, or my sex life at work & excuse myself to "go do that thing they pay us to do...you know...work." I rarely get repeats but if I do, I then tell them my cov...I mean my church...meets every full moon for ritual & worship. Clothing optional, of course. I do not get a repeat request for religious discussion after that.

I just tell them I am a nonbeliever. But I have had a chief tell me that there are certain things people don't have to discuss at work, among them is religion/spirituality. So if you don't want to talk about it, dont.