It is technically a sin redemption ceremony, yes. The act of performing it when people joined the 'Christian churches, was to demonstrate that they weren't pagans or what not any longer. The ceremony itself, the 'Johns' Baptism, is not the actual 'proposed' baptism, //Baptism by Jesus,, that many equate as the same. Baptism by Jesus is requested during the water Baptism, but there's no guarantee that anything is actually going to occur. At best you might be 'guaranteed' some sin remission, but even that is dubious as a statement of fact.
I think that Baptism, is fine. You can even perform it on yourself, //