Lawrence Memorial students do take basic science and liberal arts classes at Regis. I think it would only help you to take more classes at community college, it shows you can handle college classes. I didn't take any of the prereqs at Regis, my program worked a bit differently. However two of my classes were taught by biology faculty and I thought the both were very good. There are opportunities for tutoring, from both grad students and extra help from the professors themselves. The two science professors I had were very supportive. One of them, I think, is the best instructor at Regis. Regis is a very small school, which makes it difficult to fall through the cracks.
Some of the negative things you'll hear about Regis is about the nursing faculty. I feel this a problem at just about every nursing school, as it is a poorly paid discipline. I have had some truly excellent instructors, and some not so good. One of the best professors I've ever had now teaches at Lawrence Memorial.