I understand that as Methodist babies are baptized to emphasize God's work in our lives, especially prevent grace. But in this video you mention baptism as rebirth, would that not come until Justifying Grace. Thus the UMC rebirth and baptism are not necessarily synced. Am I missing something?

What about baptized non-practioners/atheists returning to the church of different denomination?

Does the UMC recognize LDS baptism then as Christian baptism?