Second, yes, there are many Roman Catholic doctrines that disagree with the Bible, such as Purgatory, praying to the dead, worship of Mary, etc.
Here you go concerning “Purgatory” and the Bible:
Purgatory
Mt 5:48 - be perfect as your heavenly Father is perfect
Heb 12:14 - strive for that holiness without which cannot see God
Jam 3:2 - we all fall short in many respects
Rev 21:27 - nothing unclean shall enter heaven
Jam 1:14-15 - when sin reaches maturity gives birth to death
2Sam 12:13-14 - David, though forgiven, still punished for his sin
Mt 5:26 - you will not be released until paid last penny
Mt 12:32 - sin against Holy Spirit unforgiven in this age or next
Mt 12:36 - account for every idle word on judgment day
2Macc 12:44-46 - atoned for dead to free them from sin
1Cor 3:15 - suffer loss, but saved as through fire
1Pet 3:18-20; 4:6 - Jesus preached to spirits in prison
2Tim 1:16-18 - Paul prays for dead friend Onesiphorus
1Cor 15:29-30 - Paul mentions people baptizing for the dead.
Catholic does not worship Mary. We venerate and honor her very highly. She is the Mother of the Church, helping us to be in communion with her Son.
Pray to the death:
The intercession of fellow Christians—which is what the saints in heaven are—also clearly does not interfere with Christ’s unique mediatorship because in the four verses immediately preceding 1 Timothy 2:5, Paul says that Christians should interceed: “First of all, then, I urge that supplications, prayers, intercessions, and thanksgivings be made for all men, for kings and all who are in high positions, that we may lead a quiet and peaceable life, godly and respectful in every way. This is good, and pleasing to God our Savior, who desires all men to be saved and to come to the knowledge of the truth” (1 Tim. 2:1–4). Clearly, then, intercessory prayers offered by Christians on behalf of others is something “good and pleasing to God,” not something infringing on Christ’s role as mediator.
Enjoy.
ETL.