YW. A great book that covers theological differences between Catholicism and Protestant theology is "Rome Sweet Home" by Scott Hahn. It is a first person account by a Presbyterian minister and Doctor of Theology that tracks his deep dive into his personal journey. Full disclosure, it is the story of his conversion to Catholicism based on a detailed study of the doctrinal foundations of each religion and his discovery of unresolvable conflicts in the Presbyterian theology; a fascinating read though.

Don't cave.

In Roman Catholic theology, the saints are in heaven. In the Bible, the saints are on earth.

The word “saint” comes from the Greek word hagios, which means “consecrated to God, holy, sacred, pious." It is almost always used in the plural, “saints.” "…Lord, I have heard from many about this man, how much harm he did to Your saints at Jerusalem" (Acts 9:13). "Now as Peter was traveling through all those regions, he came down also to the saints who lived at Lydda" (Acts 9:32). "And this is just what I did in Jerusalem; not only did I lock up many of the saints in prisons …“ (Acts 26:10). There is only one instance of the singular use, and that is "Greet every saint in Christ Jesus…" (Philippians 4:21). In Scripture there are 67 uses of the plural “saints” compared to only one use of the singular word “saint.” Even in that one instance, a plurality of saints is in view: “…every saint…” (Philippians 4:21).

Praying to saints is extrabiblical [outside the bible].

Deuteronomy 18:10-13 urges: “Let no one be found among you who sacrifices their son or daughter in the fire, who practices divination or sorcery, interprets omens, engages in witchcraft, or casts spells, or who is a medium or spiritist or who consults the dead. Anyone who does these things is detestable to the LORD; because of these same detestable practices the LORD your God will drive out those nations before you. You must be blameless before the LORD your God.” Praying to the dead is a form of consulting the dead, which is mentioned in this list of forbidden practices.

In 1 Samuel 28, King Saul consults with the dead through a medium at Endor. He does reach the soul of the person he was trying to reach – Samuel – but the encounter, and the consequences, don’t go well. Samuel asks Saul, “Why have you disturbed me by bringing me up?” (verse 15). Saul tells Samuel that he hasn’t perceived any guidance from God, so he called on Samuel instead to tell him what to do in battle. Samuel then tells Saul that “because you did not obey the LORD” (verse 18), Saul will lose the upcoming battle and die himself in the process.

... “Saul died because he was unfaithful to the Lord; he did not keep the word of the Lord and even consulted a medium for guidance, and did not inquire of the Lord.

The scripture tells us how to pray:

Matthew 6:9-13 - "This, then, is how you should pray: "Our Father in heaven, hallowed be your name, your kingdom come, your will be done, on earth as it is in heaven. Give us today our daily bread. And forgive us our debts as we also have forgiven our debtors. And lead us not into temptation, but deliver us from the evil one."

Prayer is not a transfer of information, but rather an act of humility.