Did Mary come back from the dead? Did Mary pay for the sins of all of humanity? No. She was a sinful human in need of saving, just like everyone else. Mary is not equal to Jesus and it is heresy to say so. Jesus agreed with this when He said:
46While he was still speaking to the people, behold, his mother and his brothers stood outside, asking to speak to him. 48But he replied to the man who told him, “Who is my mother, and who are my brothers?” 49And stretching out his hand toward his disciples, he said, “Here are my mother and my brothers! 50For whoever does the will of my Father in heaven is my brother and sister and mother.”
Venerating Mary is idolatry.