Evolution doesn't suggest everyone reproduces or "stays around long enough to make sure your children have children" . In World War 2 for example lots of 18 year old men for example were drafted and sacrificed their lives without having a chance to reproduce. Taking your thought experiment to it's conclusion you might conclude world War 2 couldn't have happened.
Your argument about selective pressure would by the same logic lead one to conclude chaste nuns can't exist and monestaries and vows of celebacy are fiction.
Religious belief just needs to be useful on average for there to be selective pressure.
Also evolutionary psychologists can't really explain the existence of gay people (attempts to do so have been a stretch, according to the evolutionary psychiatrist author of The Moral Animal) which demonstrates the limits of declaring things are impossible due to thought experiments about evolutionary pressure.
Your argument about selective pressure would by the same logic lead one to conclude chaste nuns can't exist and monestaries and vows of celebacy are fiction.
Religious belief just needs to be useful on average for there to be selective pressure.
Also evolutionary psychologists can't really explain the existence of gay people (attempts to do so have been a stretch, according to the evolutionary psychiatrist author of The Moral Animal) which demonstrates the limits of declaring things are impossible due to thought experiments about evolutionary pressure.