I mean I know the percentages and everything but I wonder if the overall atmosphere is more catholic than say Georgetown.
Georgetown is very minimally Catholic. They have gone to great lengths, in my opinion, to distance themselves from Catholicism. Notre Dame is much more Catholic, but it is not force-fed to you. The majority of students who go there are Catholic. There is no requirement to do anything but take two theology classes. The people are very welcoming.
If you want a first rate education in an environment that can still promote values, go to ND
@steveo87 Thanks.
My best suggestion is to visit and see if you feel comfortable on campus.
I gather that it’s very culturally Catholic (Irish, to be exact), but accepting of other faiths. Yes, they’re the Fighting Irish but as others have said, there are non-Irish Catholics there. Like other Catholic universities, they have an underlying Catholic message but accept and learn from all faiths and search for diversity. They often have rabbis come and speak, but are also pretty conservative.
Best of luck!
My D is a lapsed catholic. She had a bad experience with a Sunday school teacher being way over the top and since that time she’s been opposed to all forms or organized religion. She moved into Notre Dame this weekend. Clearly Notre Dame is a catholic university but the student body is global and of all faiths. I don’t think the catholic aspects of Notre Dame are overly oppressive. It is a very athletic student body and a fair number of students come from families with a lot of money and generations of ties to Notre Dame. In D’s case she’s less concerned about being an agnostic in a Catholic university than she is not being athletic or having 3 generations of relatives who are Notre Dame graduates
My D is not Catholic, and also moved in this weekend and so far I have heard nothing negative about the atmosphere. The Dean of First Year Studies spoke at the convocation, and he is an Anglican priest. (Among many other things. Quite the renaissance man!) http://firstyear.nd.edu/fys-resources/first-year-advisors/dr-hugh-r-page/
ETA: D is neither athletic nor a legacy. 
Notre Dame is the most well-known of the US Catholic Universities. That means that they will get a lot more of the families that want their kids to get their education at a Catholic school. That being said, Notre Dame is not very Catholic other than the surface. Imagery, sure. High percentage of Catholic undergrads, sure. Some priests and other religious on campus, sure. The school does little to adhere to the teachings of the faith.
There is really no reason anyone of any faith would be any less happy with Notre Dame than say, Indiana, unless they are opposed to seeing the imagery of another faith.
Just visit. We are a mixed Jewish/Catholic family. My kids wanted nothing to do with Notre Dame. When they heard that a priest lives on each floor, they were turned off. They didn’t even visit. Indiana as a state is not very tolerant.
@researchperson, you were given bad information. A priest does not live on each floor, nor does a priest even live in every dorm.
“Every residence hall is staffed with one Rector, 2 Assistant Rectors, and 4-9 Resident Assistants.
…
The Rectors are comprised of 11 priests, 1 deacon, 7 nuns, and 12 lay staff.”
Every dorm – all 27 of them – has a chapel with Masses conducted at all different times on any Sunday. The first – and last – thing that a class does is visit the Grotto. It is a distinctly Catholic institution.