My brother and I want to learn together. We grew up Conservative but I have become much more religious and he has too to a much lesser extent. We are planning to learn together. He proposed to start with Sefer Mada in the Mishna Torah. Do you think this is a good place to start? I think it could be good but I think there may be something better. He is exceptionally smart and I think he could really like religious philosophy.
I think the best approach is to read Sefer HaMaddaʿ after the Eight Chapters of Maimonides and the Introduction to Perek Ḥeleq, followed by The Guide of the Perplexed.