The Silver Flame and Other Religions – Keith

Kevin asks:

Can a member of the Church of the Silver Flame also be a part of other religions, like the Sovereign Host? I know Tira Miron was a paladin of Dol Arrah, but I cannot find anything that says if or how her faith was changed by it. If it didn’t, has the modern Church doctrine been changed to only allow for exclusive belief in the Silver Flame?

Keith discusses the possibility of crossing faiths.