The Catholic Faith also includes the Mass and the Sacraments for our salvation.
Still true today: “Athanasius suffered much in contending for the truth.”
All are welcome including (especially) sinners.
Here is a video explanation by Fr. Alar to help in the understanding of the Trinity (still a mystery).
Yes, at some point the Blessed Mother and Jesus will unify all of us.
Jesus will indeed unify all believers under His rule with the power of the Holy Spirit. Mary has nothing to do with it. If you continue to trust your salvation to an earthly woman it will not end well. Mary can no more contribute to your salvation than your can. Christ alone is sufficient