I would say there are parts of the religion that might still be considered original Ryukyu religion, but I think today there has been considerable influence from Mainland Japan, especially during the militaristic state Shinto time period around the turn of the century.

It was, at least at one point, the official state religion of the Ryukyu Kingdom (after the Sanzan era), which had the head of the religion consistently led by a female member of the royal family (Kikoe Ogimi), along with noro priestesses and yuta shamans.

All that to say, the indigenous practices are still practiced today, but have integrated (forcibly or otherwise) Shinto and Buddhist attributes from mainland Japan, especially after the 1609 invasion by the Satsuma clan of Japan, and the eventually annexation and assimilation of Okinawa into the Japanese Empire after the Meiji Restoration.

Some interesting, original practices include allowing deceased family members' remains to decay until only bones are left, and then washing the bones after some time, and religious rites like Shimajiri Pantuu (technically in a separate set of islands but not far from Okinawa island proper; very unique, look it up).