Dear John:

Sorry for the delay in responding. I have been in-and-out of the hospital for a cardiac issue.

The phrase that is used in Marian devotion is, Mary Most Powerful, not "Mary almighty" or "Mary all powerful." If you saw any reference to "Mary all powerful" ignore it as coming from someone who is a loon, or it is possible that a devotion from 100s of years ago may use that terminology, but the English in those days means something different than it does today. There are a lot of old Marian devotions that use language that confuses people today. This is the problem with language since language evolves over time. This is the reason the Church uses Latin for all official documents as Latin is no longer used in society and therefore it does not evolve, but remains the same.

Bottomline: Only God is all powerful/almighty. Mary is Most Powerful because she is a powerful woman. She had to be a strong woman to agree with God to give birth to His Son. To be pregnant out-of-wedlock suffered the death penalty. Yet she gave her fiat to God anyway.  (Lk 1:34)

She shows herself strong in telling her son to perform his first miracle at the marriage at Cana. Jesus chastises her, "And Jesus said to her, 'O woman, what have you to do with me? My hour has not yet come.'" Yet Mary insists, and Jesus complies.  (Jn 2:1-11

Again, Mary shows her strength at the foot of the Cross, standing at his feet and not fainting (John 19:25).

Mary had to have strength to do all this, but to also in crushing the head of Satan. The Church identifies Mary with the Woman of Genesis 3:15 whom God said would be the perpetual enemy of the Devil: "I will put enmity between you (the serpent) and the woman, between your seed and her seed. He shall crush your head and you shall crush his heel."

As a perpetual enemy of Satan, as the Queen Mother of King Jesus, as Mother of God, as the mother whose heart was pierced, she is Most Powerful, more than any other Saint in heaven.

Rebuke the devil who is trying to confuse you with these doubts. Be not afraid. Always look to the Church, her documents, documents of the Saints, the catechism, etc. to vet all things, including my answers about Church teachings.

God Bless,
Bro. Ignatius Mary