John Perry was a New York City police officer who also happened to be an Extropian and transhumanist, which is how I come to know his name. John Perry was due to retire shortly and start his own law practice, when word came that a plane had slammed into the World Trade Center. He died when the north tower fell. I didn't know John Perry personally, so I cannot attest to this of direct knowledge; but very few Extropians believe in God, and I expect that Perry was likewise an atheist.

Don't know about the atheist part, but seems that the man was at least a cryonicist - found this on Alcor's webpage :

Two members of cryonics organizations were lost in the 2001 collapse of the World Trade Center towers. One was a policeman performing rescue operations.