Another view point from Judaism is that baptism/mikveh was never a salvational experience. It was for ritual cleansing and it took place and does take place multiple times in the life of a Jew.
Many young men were baptized in the name of their Rabbi to signify that they had separated themselves to the teaching of that particular Rabbi. Too often the Christian church superimposes its viewpoint over top of Judaism to interpret Judaism in its light. It really is to be the other way around.