The Pope is unBiblical.
Mary’s ascension to Heaven is ubBiblical.
Much of Roman Catholicism is Biblical. Mind you it is forbidden, but that is still technically Biblical.
The position of head of the church is completely biblical, as Jesus Christ instituted it (Matthew 16:18).
Mary didn’t ascend into Heaven of her own accord, she was assumed, body and soul, by God.
Don’t you think if her physical remains were on Earth that it would be one of the most visited holy places in the world? Why wouldn’t an unscrupulous person seek to profit in the relics? Why not try to create a phony set of relics? Clearly, because nobody believed her physical body was on Earth!
While Mary’s Assumption isn’t recorded in Scripture, it does happen in Scripture (Gen. 5:24, Hebrews 11:5, 2 Kings 2:11)
The earliest recorded instance of the belief in the Assumption is found with St. John Damascene (676-749)in a copy of a letter he preserved from a 5th century Patriarch of Jerusalem named Juvenalius, to the Byzantine Empress Pulcheria. The Empress had apparently asked for relics of the most Holy Virgin Mary.
Patriarch Juvenalius replied that, in accordance with ancient tradition, the body of the Mother of God had been taken to heaven upon her death, and he expressed surprise that the Empress was unaware of this fact (implying that it must have been more or less common knowledge in the Church at the time).
Hope this helps!