There's nothing wrong with this thread or your original post. You simply announced an invitation to people of like mind to join you on an EXTERNAL SITE to discuss game development from a specific point of view.
The person/people who were "offended" need to grow up. So long as we are all mature and considerate about what we say, and we respect one another's liberty to believe/think what we want, and so long as we harm no other, we should all just get along! :-)
I doubt Rhindon would be offended by an announcement of an atheist game developer forum, or a mom's game developer forum, or Muslim or Buddhist or whatever-other-classification-of-people-group game developer forum. Who cares, right?!
LET'S JUST DEVELOP SOME GAMES! :-)