I recently watched an Orthodox presentation. It was interesting. They considered Roman Catholic as, essentially, apostate (I did not realize the extent of the divide). Where RCC holds to the doctrine of transubstantiation Orthodox Catholic does not (they do nor explain ir but leaves it to "mystery"). Baptism was interesting because they view anything but immersion as not being a true baptism but practice infant Baptism.
What is interesting to me is that Baptist doctrine does not (historically) have to mean immersion but it cannot be infant Baptism. Orthodox can be infant Baptism but has to be immersion.
Anyway... Just a few wandering thoughts from a wondering mind.