I assume it would be inadmissible to advocate the worship of Huitzilopochtli (Aztec war god), who required human sacrifice.
Likewise, I imagine Allah (Islam's god) is out, who required the murder or subjugation of all other people.
Shall we then consider any certain religion off-limits if its doctrine espouses or requires illegal activity, as the two above examples do?
We do have some Muslim Freepers and they are welcome to post, but we would obviously reject any Islamic hate-mongering source websites, e.g. al Queda.