I think Monte is extremely strong at gaining faith. A Jag can also 1v1 a barb camp early game. You take authority, and just go in. The axes make for really easy barb camps. I feel like if throwing axes never spawned as barb camps (if they started as spears, then spawned axes to support), Monte would be much weaker. I've heard that faith isn't worth much, but I am not sure I agree. I'm sure that there are better ways to play, but I am fond of taking auth/piety, taking the +ranged/winfaith panth, and getting the buy units with faith religious perk. The thing is, you can buy a knight with 240 faith through medieval. If you are properly farming/warring, that's almost every turn (probably every, or more, honestly.) As well as the fact you don't need any special buildings to get it. I don't even use all of my units, I feed them to my city state buddies and let them take cities. It's hilarious to watch them just mob an AI and expand their empire.
I also play on Epic, and I would say for sure that buy units with faith + auth + gain faith panth... makes Monte almost too strong early to mid-game. Then it's just about whether you want to keep crushing people or let them catch up. I kind of think there should be a cooldown, like they put in with buying diplo units (didn't they?) for faith buying. Or make it so you can't buy any units with faith in any city. Maybe even increase the cost. That's the one OP part of Monte, for me. Otherwise, he's really good, but without that, he wouldn't be nearly as formidable.