I was once influenced by Protestant through and went to a Protestant church and participated in a (predominantly) Protestant fellowship. Some of the things that I appreciate about the Catholic church are the deep and almost mathematical thought that goes into our cathechis, the existence of uncontestable miracles, the peer-review process for figuring out the truth, and the examples of great holiness within the Catholic Church (Mother Theresa, St. Maximilian Maria, St. Francis of Assisi, St. Padre Pio). In order to reframe your belief on Mary (which is probably somewhere between seeing her as someone mildly disturbing or unimportant and seeing her apparitions as closely linked to the AntiChrist), I recommend that you read books about her, devotion to her, and the power of the Rosary. I have personally read St. Louis Mary de Montfort’s True Devotion to Mary and Secret of the Rosary. I have only read small selections from the Secret of Mary, but that may ultimately be a good resource. Remember, His Holiness Pope John Paul II said that True Devotion to Mary was a “decisive turning point in his life,” and both St. Therese of Liseux (by the way, Mother Theresa chose the name Theresa after St. Therese of Liseux and St. Therese of Liseux is called the greatest saint of modern times) and St. Maximilian Maria followed True Devotion to Mary religiously. I believe it was his devotion to Mary that helped St. Maximilian Maria, while in the concentration camp, continue to lead others to prayer and praise to Jesus and Mary, offer to die in place of another who had family, and starve and dehydrate for three weeks before dying with a shot of carbolic acid. He earned the title of Righteous Among Nations by the Jewish people on Jewish Virtual Library. Could he have done it without the Immaculate Heart of Mary? From the way he lived his life, including I think posting exceprts of True Devotion to Mary on billboards and spending his whole life spreading her devotion, I think he would have said no.