So would you have to be gay in order to play at a gay church? How would they screen you? rhetorical questions of course.
No, you wouldn't. I know of many, many gay churches; two of them have straight musicians. They screen potential musicians the same way any other church would. They want to know about your skill, work ethic, relationship with God, spiritual beliefs, experience, and personality.
I don't agree with churches that bash sinners. I've had a pastor that corrected me as soon as they realized I was sinning. As soon as I was corrected, the matter was left alone. Noone bashed me. Had that happened, I would have left. On the the other hand, I found comfort amongst friends because I knew they would accept my sin but it did not warrant my deliverance. A completely gay church seems like a refuge of comfort rather than a place of deliverance. I admit, I am not knowledgable on the matter and would like some insight.
Indeed, many inclusive churches provide refuge for gay people. If there were more straight churches that provided that refuge, the inclusive churches wouldn't need to exist. The reality is that many, many "straight" churches do indeed bash and abuse gay people. The opinion that U13 shared is commonly held among many pastors:
if they just stop walking and talking so feminine, maybe they won't get harassed in church. Well, to that, I'd say: if WE start walking and talking like Jesus, NOBODY would be harassed in church regardless of what they look like, smell like, act like, sound like, or regardless of who they sleep with.
NOBODY should be harassed or abused in church. Nobody. And as long as we continue harassing people, inclusive churches will continue to be built, providing safety and refuge for the abused.
For the record, the churches I'm familiar with are not "completely gay" churches, as you referenced. They are inclusive churches that basically accept EVERYONE as they are, and make a commitment not to bash or ridicule anyone for whatever lifestyle they live. Most of them do preach deliverance from sin, and provide counseling services for those who want freedom from whatever sin they struggle with. Their goal is not to make anyone feel GOOD about their sexuality, but to provide a place of safety in a church setting. Every single inclusive church I know of has an abundance of heterosexual members, although the majority is gay. In fact, the most prominent inclusive church in Atlanta has an assistant pastor who is straight, married, with children.