My son's family recently joined a Pentecostal church. What measures can I take to help my grandson adjust?

He is only 4 years old... should I start him out with handling earthworms, or maybe even some garter snakes before they give him live rattlesnakes for their 'taking up serpents' part of the worship service? Should I get him knee and elbow pads and a helmet to wear so he doesn't hurt himself when they get to jumping around and rolling on the floor? And what about the adults when they do that? Should I tape an orange bicycle flag to him so some 300 pound church lady doesn't miss him standing there and trample him in her religious frenzy?