Here's one thats not atheist but its funny... i thought
There was a neighborhood full of catholics mainly and there was one Baptist that lived in the area... This guy every weekend would cook steaks out on his grill when his neighbor asked him kindly that he would cease because the catholics only ate fish that weekend... (not sure, is it every weekend or only the easter area?) well after many a discussion such as this they finally convinced him to convert him to catholicism and when he was to be baptized they spoke "born a baptist, raised a baptist now a catholic... So they were all excited cuz no more steak grilling... Come the weekend there he was back out in his yard grilling some steaks.... Catholics came up and told him that he can't do that now that he's a catholic its against their beliefs... So he takes his dousing water and goes... born a cow, raised a cow, now a fish

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"So there I was completely naked and covered in tartar sauce..."