Greetings PheGNOMEnal!

I run with the Knights of Memory on the Midgardsormr Server. And I believe we meet the majority of the criteria that you are seeking.

You are looking for:

Adult conversations without the PG13 to R-rated language/themes. - Check!
VoIP - Check!
Website (not required, but appreciated). - Check!
Relaxed atmosphere. - Check!

Christian based. - Hm, let me explain.
Our FC is based on those kinds of principles.
However, we do not talk politics, religion or things that might be dividing to the group.

If we might be your cup of tea, you can find out more below:
http://forum.square-enix.com/ffxiv/t...New-Members%21

Either way, I hope you find the group that you are seeking. Good luck!

-Vix