So many words which we use in our faith, in church, in liturgy, are words which have become "solely" church words. Think "sin". When you are playing a sport, singing, playing the piano...and you mess up...how often do you think, "I have sinned." And yet in both Hebrew and Greek the word we translate as sin were in everyday use; our word "sin:" in Hebrew meant to break, to unravel, to shred, to cross the line, to miss the mark.
Likewise with Baptiso. In greek it meant literally to immerse or submerge. So when Paul uses baptiso in his letter to the Romans it has a broader meaning than just a one time event.... "When we are baptized in Christ..." When are immersed...has a very "now" element. It helps to let our imaginations open up and see the everyday implications of being immersed in God...
https://www.youtube.com/watch?v=FUT-yUvWUdY