I missed the “Christian” school part.
I’ll tell you - you don’t say where you are from but since you looked at Illinois (great school), Northwestern and Chicago, i’ll assume from Illinois.
Many Illinois kids are leaving - Arizona, Alabama, UTK, etc. They’re cheaper OOS than in-state.
Illinois is great. But other schools are fine too.
Here is one list. There are many rankings out there but if you find commonalities (and Illinois is typically a top 10 and sometimes higher), you can assume they are a well thought of school (which doesn’t necessarily mean a good program…just good rep). Always research to make sure the program is right for you.
Top 50 Bachelor’s in Computer Science Degree Programs 2020 - Computer Science Degree Hub
You don’t find Christian schools on these lists. I looked at US News Grad - not undergrad - and the first religious school (Catholic) was Notre Dame…so going to the Christian college for CS probably not in your future.
As for Stanford and B School - get that out of your mind. You are a long way off- and your undergrad is important but not as important as your GMAT and most importantly the work experience you get after you graduate. You will see kids at Stanford Business School from Harvard - and Southern Illinois. You may get out - and decide B School isn’t for you. You may get a job you love and never leave. You may not even finish in CS. No one knows the future that far in advance - that’s what’s exciting about the future.
So take one step at a time - find a good undergrad, get accepted, go, learn and enjoy. Worry about the next step long after this step is done.
Good luck.