The mikveh isn't ''baptism''. So, John was not performing the ''mikveh''. Keep in mind that ''Judaism'', rather common Rabbinic Judaism, was not extant at the time of Jesu, so, this baptism referenced in the NT, is before any ritualized organized ''judaism'', hence not really a comparison here. Obviously there were some different ideas in Israel, eg Essenes, Sadducees, Pharisees, /at least, hence, there is not much to compare the Xian baptism to..it is what it is.
The Xian baptism, /the water baptism/ was for sin cleansing, I believe; however, Jesus was not considered a baptizer, like John. Jesu's baptism is completely different, and is not so much symbolic, or merely the remission of sins, but rather for 'salvation' purposes, etc. The church basically adapted Johns baptism as its own, then they baptize ;;in the name of'', (they aren't actually saying that Jesu is de facto baptizing the person).