Without a doubt, NYC is a (mostly) Jewish town. Some of city laws are based on Jewish traditions -- like a child's religion being based on the mother's faith.
Today's in Rosh Hashanah -- the Jewish new year (http://en.wikipedia.org/wiki/Rosh_Hashanah). The city doesn't seem as chaotic as other days. Many people are on holiday at home or temple.
Well all this doesn't mean that mostly everyone here's Jewish (although a good percent, especially in Brooklyn, Rego Park, etc). There are many religions and faiths. For the most part, most of us get along.
As a Christian, I celebrate Ash Wednesday, Good Friday, Christmas and New Year's day -- aside from the holidays that take place on Sundays like Pentecost.
