The religion known as Roman Catholicism today is not Christianity. It is of a different gospel, inveigled with such heresies to Christianity as making Mary much more than an Earthly Mother blessed above all women. Catholicism seeks to make a business to empower their organization, their institution. The business is salvation by their definitions, so the adherents are ever striving to obtain, and the catholic mischaracterizations of Mary the Mother of Jesus as somehow the mother of god serves the confusion the institution needs in order to promote the Mariology so rife in that religion. But it is not Christianity.
The arrogance of an pseudo-adoptionist suggesting that Catholicism is not Christianity...its amazing.
It is not only Christianity, it is the ONLY, TRUE, COMPLETE Christianity on Earth....all other so called " denominations" are just that...either incomplete or in error, or both.