All diving along the RM IS drift diving, however, the current is usually light and often barely noticable. It tend to be just enough that if you had to go against it you'd notice. In the winter months we get more current that you can actually have it move you along a bit. Cozumel current is much stronger.
The RM is a perfect location for a new diver. The diving is easy and most shops use panga style boats with no more then 8 divers. The dives are generally shallower (less then 65ft), and over reef not wall dives, which is usually good for new divers since they can always see the bottom. Boat rides are no more then 10 minutes and the shops usually do three, 1-tank trips daily, returning to the beach for SI's and to switch tanks. They usually let you book a single dive as well, so if you aren't ready for 3 a day, you can do one or two. Times differ a bit with the shop but are around 9am, 11:30 and 2pm.
I've been going to this area and Cozumel a couple times a year each for about 5yrs now and find the diving around Akumal and Aventuras to be the best.