In geometry, for example, we have a theorem and it is more important than corollaries derived from it, so a similar situation may hold here with respect to creation vs. mode of baptism. Creation is a fundamental theorem, as it were. The bottom line, though, is a conflict between religious world views. That in summary is why the issue is important. Now let me try to amplify that by providing a few details.
Biblical creation is supernatural.
In plain language it was a miracle. Creation was by direct acts of the Creator as opposed to some naturalistic process. Creation took place in the beginning and was finished and complete. Creation was not spread out over a major portion of the supposed evolutionary vast time history of the universe. Creation was by the word of the Creator.