Catholics believe Mary is the mediator to Christ. The Rosary, which is the most common prayer ritual of Roman Catholics, has ten prayers to Mary for each one devoted to God. One of the important developments was the promulgation of the Dogma of the Immaculate Conception of the Virgin Mary in 1854, that is, that Mary was conceived and born without sin, and remained sinless throughout her life. It is also claimed that Mary remained a virgin and had no other children, though the Scriptures speak of the brothers and sisters of Christ (John 2:12). “After this, Jesus and his mother, brothers, and disciples went to Capernaumand stayed there a few days.”(Mk. 3:31-33), ( Mk. 6:2-3).
Catholics will tell you those Scriptures speak of his brothers and sisters as an expression of being brothers and sisters in Christ, but not actually siblings. In 1950, Pope Pius XII declared the Dogma of the Bodily Assumption, that is, that Mary was taken bodily into heaven after her burial and crowned as Queen of Heaven. There is nothing in the Bible to support such teaching. While professing innocence of idolatry, the Catholics are worshipping the creature more than the Creator.