This is directed at onlookers of anti-gay bible-thumpers ("Repent and choose heterosexuality!" or "God wants you to have sex only within opposite-sex marriage") at LGBT pride events.
There are plenty of rebuttals that uphold the theistic worldview; I think it's better to (gently) give a secular humanist perspective.
The flyer could be adapted as a more general response to bible-thumpers.
Feel free to use, adapt, and improve!