A whole LOT of gentiles learned the words to "Hava Nagila" by way of Harry Belafonte, as it turns out.

And there's a long, long tradition of atheist Jews who still maintain family and cultural ties. The menorah I light? My great-great-grandparents brought it with them when they came to this country from Russia in 1888. I'm not going to give up lighting it just because of a little detail like not believing in God. Some things are important.