Being Blunt

My manager and a peer were discussing their project this morning and joking about it while I was staring at my PC when I thought I heard my name mentioned again so I peeked behind my monitor and asked them what it was they're discussing. They were telling me, as a kind of joke, that my manager should first convince me about something (I didn't really catch what it was) because I am hard to convince, as I am an atheist. My manager said, "but he is not an atheist" and turning to me repeated it, "you are not an atheist" and I replied: "What is it to you? Is it relevant to your project?" Yes was my peers reply. I asked them again, "how is my lack of belief relevant to your discussion or project?" My manager insisted that I am not an atheist. But I stood firm and asked him again "why is my belief a relevant subject in our work environment?" Sensing that I was serious, they changed the subject. Sometimes, you have to be blunt in order to deliver the message.