I dont know of any Nursing program that requires you have a CNA. I will say that having one can only help. In my program your schedule is determined by the department and those who are CNAs or have nursing experience are placed together and have a different experience than others. BTW I attend Triton College.
I had to take my CNA in California before I got into the nursing program. I was like wth but I moved to Texas & realized that by taking you CNA you are getting rid of RN classes. In Texas I had to take nursing fundamentals well that's in the CNA class but they didn't count it here. So it's almost the same thing but now you have a license to get a night pt job. Good luck!!