While New York's worshippers are filling churches, mosques and synagogues to pray tomorrow on the National Day of Prayer, atheists in the city will be gathering to protest.

The Center for Atheism, a national group of atheists based in New York City, will be holding its annual Gift to Life Day as an alternative to the National Day of Prayer on May 1. Atheists - as well as anyone else wishing to participate - will visit their local blood banks to donate blood and sign up for organ donation programs, said Ken Bronstein, president of both the CFA and New York City Atheists.

Each year, the U.S. president proclaims an official day of prayer and encourages citizens to participate. "As Atheists, we don't think this is right," Bronstein said.

He said the blood drive is a positive reaction and it "reflects how an atheist would approach a problem."