It's impossible to tell even if presenting the Brotherhood as an all-male organization was intentional or if the lack of women was an afterthought. I mentioned in my notes "where are the women" right before that one shot came up, but I don't think there are any women in the rest of the season that I can recall. Maybe if you look closely at the faces of the aspirants and squires you might spot one, but they've probably got crew cuts or buzzcuts like Dane's, so you wouldn't be able to pick out the women from the pretty boys.
Even if there were more women scattered around that I missed, I do think that the decision to cast mostly men was intentional. These are the kind of things that casting directors and extra wranglers have to think about, and given how tipped in favor of men things are there must have been some rationale at some level.
Now, whether that came down as a mandate from the showrunners or was just a vague aesthetic decision of a casting director, we cannot say. But the imbalance is definitely there, and is notable.
I literally said that he HAS seen it. Maximus tells Lucy that guys make a move and their thingy gets better and explodes. Which means he's seen it, but doesn't know what it is, and has apparently never done it to himself.
Joking aside, I think it's pretty clear that the primary implication from that scene is that Maximus has made his own cock explode (to borrow his term), he's just embarrassed to admit it because he doesn't realize it's normal for some reason (same with not wanting to admit his cock gets hard). He talks about hearing about those things happening to other guys, but it's very clearly a "Hey doc, my friend's got this problem..." situation.
A Frankish crusader might not know all the details of the litanies or Latin, but he does know that Christ is Lord & Savior, that God is the Trinity, and whatever else his priests told him - because that was how pre-modern and illiterate people received religious ideas. They were derived solely from ecclesiastical authorities. So that Crusader wouldn't know everything about Christianity but he would fanatically believe in Catholicism and the righteousness of his mission to the Holy Land. Nobody in the Brotherhood cares about anything. Titus jeopardizes a critical mission because he's "bored," and Titus is presumably a highly ranked knight since he was dispatched directly from the Commonwealth.
I agree, the typical crusader would forthrightly and honestly believe in his religion to some degree and have some basic idea of its tenets - Just the same as Maximus has some basic ideas of the tenets of the Brotherhood. He's just not a particuarly bright.
As to Titus - I didn't realize we were talking about him, I thought we were just talking about Maximus. While, as we've established, I think the typical Frankish Crusader would forthrightly believe in his religion, that wouldn't hold true
universally: there will always be cynics, opportunists, and outright sociopaths among the ranks. Indeed, this is true for the historical Crusades: The First Crusade by all accounts was in large part motivated by genuine sentiments (though there were also material considerations, conscious and unconscious), but as the programme of crusades proceeded the "mercenary" and material motives began to take greater prominence.
As to Titus dicking around more generally: I don't think someone being a cruel and vindictive dickbag is at all at odds with anything. I'm going to go out on a limb here and say there were probably a lot of Crusaders that were cruel to their squires or their camp followers. There are cruel and malicious people out there, regardless of what they may believe in. He thought he could get away with toying with a young Aspirant, and he did until he didn't.
Now that said, I think they go over-the-top with how cruel and vindictive Titus was - Why on earth would someone who just got mauled and has their life in the hands of someone else say "I'm gonna kill you, we're gonna rip you apart and eat your bones when we get back to base?" etc. etc. - but that's just a problem with basic character writing, not some fundamental rupture in the idea of the Brotherhood.