1 Corinthians 3:14-15 does not describe purgatory at all. It tells us that Jesus Christ is the foundation upon which people of the church, ie christians, build our lives, hence works. It tells us only things done in Jesus name and perfect in the sight of God will remain, for they will be tested with fire. A believer is saved not by works, but by faith, therefore, if his works were dishonest or not in accordance with the gospel, these will be no more but the believer himself will we saved for his faith. The catholic church, namely that of the roman catholic and papacy have for ages been seen as synonymous with christianity, however, if you pray in the Holy Spirit and read the word diligently in the Spirit, He will prevent you from falling into false doctrine and reveals the fullness of the gospel, as we are told in John 14:26 "But the Helper, the Holy Spirit, whom the Father will send in my name, HE WILL TEACH YOU ALL THINGS, and bring to your remembrance all things that I have said to you." If you do this, you will find that the catholic institution is effectually anti-christ. Hebrews 10:14 emphatically declares, "By one sacrifice he has made perfect for ever those who are being made holy." Hence, those who believe in Christ are "made perfect" forever; no further "purging" is necessary. First John 1:7 says, "The blood of Jesus, his Son, purifies us from all sin." Romans 8:1 says, "Therefore, there is now no condemnation for those who are in Christ Jesus."I urge you to devour the Bible as though it were bread to a starving man and seek God's guidance daily in prayer. The very idea of Purgatory fails to recognize that Jesus’ death was sufficient to pay the penalty for ALL of our sins.
Remember the catholics also believe that mary is an intercessor for god when 1 timothy 2:5 clearly states "For there is one God and one Mediator between God and men, the Man Christ Jesus,". We are also commanded to make no graven image or idol of anything living or on, above, or under the earth. Mary, while unquestionably the most blessed woman who ever lived and who, im sure is near to the Lord for all eternity, was not to be worshiped. While holy, as all the saints, she is not God. I hope this answered your question. I had to tear into the previous answer because it is false doctrine and not in accordance with the Holy Spirit and the gospel of our Lord, Jesus Christ. Peace and grace to you in His name.