During his recent visit to the United States, the pope stirred up quite a bit of controversy when he canonized an 18th-century friar named Junipero Serra. The pontiff sought to recognize the friar for his work in bringing Catholicism to California, but there are some who claim he treated Native Americans harshly. This explains why a statue of Serra was vandalized after his elevation to sainthood was announced. As you can see, when your sainthood depends on your conduct, there will always be someone who will stand up to contest it.
How different it is with the saints mentioned in Scripture! The Corinthians were known for their carnality (I Cor. 3:1), yet Paul calls them βsaintsβ (I Cor. 1:2). If you are wondering how this could be, it is because Paul knew that the verb form of the noun βsaintβ is sanctify, and while the Corinthians were carnal in their conduct, they were βsanctified in Christ Jesusβ (I Cor. 1:2). In the Bible, men are βsanctified by the Holy Ghostβ (Rom. 15:16), not by any earthly church. They are βsanctified through the offering of the body of Jesus Christβ (Heb. 10:10), and not by their behavior. Rome awards sainthood to men who are known for good works, but the Lord says that men are βsanctified by faith that is in Meβ (Acts 26:18).
So it is that while the canonicity of all Romeβs saints can be contested by men, not even the devil himself can contest the sainthood of the believer in Christ. Itβs no contest! Just remember, sainthood is a high calling, so make sure βthat ye walk worthy of the vocation wherewith ye are calledβ (Eph. 4:1). source