A few years back, I looked into various beliefs and practices regarding water baptism.
Besides sprinkling vs immersion, and Adult vs Infant baptism, there are issues including whether the water is natural or not, as well as whether it is flowing or not. in whose name one is baptized (Some say one must be baptized in the name of Jesus, but do not recognize, for example, my baptism in the name of the Father, and of the Son, and of the Holy Ghost. (see Acts 2:38, which only specifies "the name of Jesus" only)
In order to join their church, I would have to be re-baptized.
My approach in these cases is that it is much more important to have a clear understanding of what it is (for me it is a public declaration and act of obedience).