Tyr and Zisa are RL Mythology Gods, specifically of the Nordic Mythology: http://en.wikipedia.org/wiki/T%C3%BDr
I personally find it quite unappealing, as a fair deal of creative process is skipped by importing already existing lore.
They might indeed have a place in RL but again I state that My Tyr has both his hands thank you. Infact I doubt there is many similarities at all between him and his RL counterpart, or Zisa's though I have not looked into it.
I ask where have I imported existing lore? Aside from an IC religion?
I find it very much more unappealing and quite distasteful for a character who is devout to one religion one day, to simple switch to a completely new one that holds nothing the same, the next day. Its stinks of plain old powergaming and OOC "Knowledge of the Universe" as we called it.
The process should take weeks, even months if not years. My Tyr and Zisa might be very similar to the Order's but there are subtle differences that suggest a new interpretation of the religion, or as one would say it, an evolution of the understanding of it.
You must also find it very annoying that every religion ingame can find an aspect of it in a RL counterpart... Heck almost everything we do has such!
Vellos, they may indeed revolve around the Bellator family. But what is more wrong: Following the roleplay and the religion of which you were very devout and trying to find some sort of compromise or something which you can grab ahold of and hold on to in a new one? Or just straight up converting even after roleplaying a devout religious worshipper and converting to an apparently atheistic religion straight off the bat?
To me the second one is OOC, distasteful and frankly bad roleplay in the extreme. It should be a long and emotionally charged and painful experience. You have just realized your gods are not real/do not care. Your temples have fallen, your priests are dead or have left. You need to work out what has happened and reconcile it with your personal faith. You will need time to understand and come to terms with it.
That or you are the sort of person who would happily bury his child one day and that night go out for a long party and have fun, maybe pick someone up...
Yes Bellator imported the names from RL and other games... and? So what.... many of the religions in BM have similar things or straight off just rip things directly and spice it up a little...