If this is truly the impression you got, then it's because his backstory is poorly worded. In truth, I did struggle with finding the wording for the details...
Yeah, it was a first impression, but when expanded upon fits a bit better with my expectations.
As to Bren's (non)choice of deity: he worships a philosophy. His world-view, outlook and personality are closest to those of Quaren; however, his interest is in improving the stability and security of Irthos as a whole rather than any of it's three deities specifically. Not only is dedication to a philosophy rather than a deity allowed by the rules, if you look closely you'll see that his alignment and domain choices are all actually in line with the worship of Quaren - he could worship that deity with no mechanical changes to his character. I'm not doing any cherry-picking here, I just liked the idea of a more panthiestic priest dedicated to all of his "native" deities and saw no reason to restrict him to just the one.
I am just an old geezer that prefers a marriage between a cleric and a deity to be monogamous. I also remember when praying for spells was
asking for spells and your deity could respond, "Ah, you are not making quota and you attitude is not cheerful enough. You don't get that one today. Try impressing me by putting this spell to work instead." Back when deities could see into the future, they sometimes would give you what you needed, not what you wanted.
In other words, Yeah, the worshiping a philosophy is there in the rules. I have a personal dislike for it, but it can be used. Worshiping a pantheon instead, which is what you are going for I believe, is also possible. The deities you chose have three distinct philosophies. Honor and law, science, ends justifies the means.
As a pantheonic example: I prefer it as worshiping Athena, but also saying the occasional prayers to Hephaestus and Dionysus. Athena would be where you get your spells, aura, formal restrictions and such from. Hephaestus or Dionysus might help you out in a pinch though. Athena's temple is your home, but you have "beloved friend or brother" status at the other two temples. The first impression was "stopping at any of the three temples would do.", which personally seemed loose. So I was suggesting a bit more focus.
My opinion on switching alignments is yes for all the classes, but the impetus/reason to do so needs to be a bit stronger for monks and clerics and a lot stronger for paladins.
On a quick glance, nothing on Bren's sheet would slow me down on the approval process or cause a kickback for tweaking. I just haven't had the 45 minutes in a straight chunk of time to focus and do the review the last few days. I got this sword crafting and introduction I am supposed to be working on.
