Infiltrate the club and ask questions. You could even tell them you're atheist and if they won't let you in that's discrimination. If they do let you in that would be fun. Don't worry they'll let you in. Christians love to defend their beliefs. It's expected of them. The bible says so. Although it also says be discreet.
Belief in a Cruel God makes a Crueler Man. Thomas Paine with minor edit crueler instead of cruel.