There are enough eyes looking upon the body of Christ seeking discord. Absolutely there are groups outside the body of Christ due to severe theological flaws, but there is much unnecessary discord over interpretations that are not central to salvation.
Look, the Church understood it from the beginning to mean triple immersion and for a good reason. The language of the Church was Greek. This is not some private interpretation or a matter of private taste. If the immersion is misunderstood Chrsitians outrside the Church, you can imagine what else is. Making a church according to one's private preference is a man-made "church."