3dmm is a forum for kids.
Their play area looks interesting, but what if their mods are also kids (like on physicsstackexchange)? The latter has some pretty nasty bullies for moderators (and they are also kids).
Anyway, welcome RobertC.Nelson. There are many ideas submitted on your link. If you don't mind my asking, which one interested you enough to draw attention to it here?
Sciforums is organized (self or moderator enforced) by topic. If you have an idea about religion you want to post, it should go on the forum "religion" for example.