Fair point, but debatable. The question is, can you do more with the production bonus than the AI can, given that the AI already has steep production bonuses (at higher levels) than you do? Put another way, are you better off denying the production bonus to yourself (and your AI neighbors -- although some AI will probably take it for itself, and it may spread to your neighbors anyway), or taking the bonus but having to share it with your neighbors? IMO whether and to what extent that is a concern depends on the map and how broadly you expect your religion to spread. If you are late founding, and your nearest neighbors have their own religion, I see much less of a concern. In the specific case of Religious Community, I never take it as my first follower belief, but often consider is strongly as a second if I'm going tall (little point taking it if I'm going wide with a bunch of 5-7 pop cities).