Surely you know that the Catholic Church admits to incorporating Babylonian paganism into it's beliefs and rituals.
The use of temples, and these dedicated to particular saints, and ornamented on occasions with branches of trees; incense, lamps, and candles; votive offerings on recovery from illness; holy water; asylums; holydays and seasons, use of calendars, processions, blessings on the fields; sacerdotal vestments, the tonsure, the ring in marriage, turning to the East, images at a later date, perhaps the ecclesiastical chant, and the Kyrie Eleison, are all of pagan origin, and sanctified by their adoption into the Church.[Cardinal Newman - Development of Christian Doctrine, pg 373]
Two things, the first is that the concept of the Sabbath was taken from the Jews, and made Christian.
Second the things Blessed Newman speaks of are not novel in themselves, such as rings, incense, etc, as they were used by Jews and pagans alike.
Most importantly is what Newman said, “sanctified by their adoption into the Church.”
At 377, Newman quotes St. John Damascene: “As the holy Fathers overthrew the temples and shrines of the devils, and raised in their places shrines in the {377} names of Saints and we worship them, so also they overthrew the images of the devils, and in their stead raised images of Christ, and God’s Mother, and the Saints.
Later, he quotes from his work, Essays (at 380-382):
“Mr. Milman argues from it,—’These things are in heathenism, therefore they are not Christian:’ we, on the contrary, prefer to say, ‘these things are in Christianity, therefore they are not heathen.’”
As the Pantheon was originally built to worship all of the Roman gods, so it was Christianized, to become a house of worship, honoring the One, True, God.
Many religious ideas are common to all mankind, but that doesn’t make either Christianity or Roman Catholicism syncretic.