A lot of colleges are technically religiously affiliated but provide essentially secular education and have diverse student body. Think Yale, Notre Dame*, Brandeis.
My Granddaughter goes to Baylor and she's not religious. She went there because they offered her very significant honors scholarship. It's a college where there are a lot of kids of rich parents (like Many) but she is not one. Im very proud of her, she's getting ready for her second trip to Africa for a medical assistant endeavor, she's pre med.
Totally honest, I got more tail at church camp in Gearhart 6th/7th/8th grade summer than i knew what to do with. First a lot of things took place on those holy camp grounds.