I don't know who told you this nonsense, but they were wrong.
For starters, there is NO LIST of Popes that suggests that the Church has ever considered Constantine the Great a pope.
The question you need to ask yourself See Revelation 2:12-14 Pontiff is a Pagan term for the head
shalom b'SHEM Yah'shua HaMashiach
of the pagan state religion from
~300 BCE through ~400 CE.
is why did the leader of the ROMAN "church"
take on the trappings of Paganism
from Babylon by way of Pergamon ?
Woo hoo! So now you think that because a term is used by other religions, it’s wrong? So do you say that “head priest” as the ancient Jews used it was pagan because even the priests of Ba’al had the same term? That’s the stupidest thing I’ve heard today. No wonder we have idiots who deny the divinity of Christ and the Trinity over here making silly hashem, bashem, tracshem statements.
btw, why does your cult of British-Israelism believe that the Anglo-Saxons are the lost tribes of Israel? And also, why does your cult deny the divinity of Christ and the Trinity?