I'm a current M2, and I think I can answer some questions you have about CUSOM (Yeah, that's our abbreviation lol).
The only Jesuit influence I've experienced so far is in ethics. They do tell you what they consider is OK and not OK in their Christian hospitals (obviously, as a Christian institution, they are pro-life). They don't force this down your throat though. They try to make it more of a discussion than them telling you what you NEED to believe, which is important. Everything can be viewed from different angles. Other than Ethics, you do have to attend the memorial service for your cadaver at the end of your first year, which is held in the church. It's not so much a religious experience as it is just them saying really nice speeches and acknowledging the sacrifice that the cadavers and their families have made. It was quite lovely. CUSOM doesn't have preference, or really care much, about your religious affiliation, but they do just want you to be a loving, caring human being, which is the most important thing.
There are sparse mandatory classes. Small group sessions (maybe once a week or every other week for an hour or two) and a few classes have a mandatory presentation. It's safe to say I don't go to class lol. I prefer going at my own pace (2x speed) at home. They know class isn't for everyone. It usually has to be very important for it to be mandatory (like a guest speaker, grand rounds, or patient panel).
In terms of diversity, Omaha has a rich population of people, with quite a bit of diversity and a lot of ma and pa restaurants and bars that reflect that. I did a lot of tours for the school this past year for med applicants, and they were always a mixed bag of people from different backgrounds, and it was great. There are A LOT of people from California lol. That's not necessarily a bad thing.
The school does offer a lllloooottt of clinical outreach experience, not so much during your first semester since you're just learning how to function, but there are three clinics you can work with: Magis Clinic, Healing Gift, and Porto Clinic. I was lucky enough to do each of them, but I did Healing Gift the most. You're allowed the option to do rotations in rural medicine too, if you choose so in 3rd year. Also, during your summer break, you can do their scholarship (2,500$) program in rural medicine in NE through the Family Medicine association. There is also CURA, which allows you to travel outside of the US. It's good stuff.
Overall, I really love Creighton, and I NEVER EVEVEVEVEVEVER would have expected to end up here initially, but I am so glad I did (originally from a big city). I was like "yeah, sure, I'll apply here", but then I was blown away by them and was so happy when I got in. If you're on the fence of applying, I would highly recommend you finish that secondary app.