Oh no, no, no I’m sorry, but that is way off when it comes to Baptism. We have first century reference to non-immersion baptism in the Didache, which is cited by another poster. In addition, early churches were often built with baptismal fonts/baptistries that were too small for full immersion.
Again, ancient Christian mosaics depict pouring.
And again, early Christian testimony suggests other modes of Baptism.
“If water is scarce, whether as a constant condition or on occasion, then use whatever water is available” (Hippolytus of Rome, The Apostolic Tradition, 21 [A.D. 215]).
Pope Cornelius in AD 251 wrote that as Novatian “received baptism in the bed where he lay, by pouring” (Letter to Fabius of Antioch). Again in the mid third century, Cyprian of Carthage said that no one should be “disturbed because the sick are poured upon or sprinkled when they receive the Lord’s grace” (Letter to a Certain Magnus 69:12).
But when it comes down to it, we should accept that the New Testament is not a how-to church manual. Christians were already “doing church” before the writings of the NT were complete. And as the Didache expresses, Christians were baptizing in other ways in addition to immersion, even in the near apostolic age.
So I challenge back, if ancient Apostolic christian communities (Catholic, Orthodox, Oriental Orthodox, etc.) AND writings (shown above) accept theses modes of baptism, why don’t you?