Speed Baptism [baptise as many people as you can before time runs out, and it has to be FULL DUNKS - none of that pansy sprinkling nonsense]
Endurance Baptism [two-player teams compete for best time; longest hold under water w/o drowning wins]
Free-for-all Team Baptism [4 vs. 4 player teams; forcibly dunk members of the other team for points]