Even if Christ is already in heaven and seated at the right hand of God (Colosians 3:1, NIV) however, he didn't appoint anybody to replace Him being the head of the Church because according to Apostle Paul, "He continues forever".

24 But He, because He continues forever, has an unchangeable priesthood. (Hebrews 7:24, NKJV)

Put it in your mind, Christ was the Head of His Church when He was still here on earth, and He is still the head of the Church now and forever, because according to Apostle Paul, "Christ is the same yesterday, today and forever".

8 Jesus Christ is the same yesterday, today, and forever. (Hebrews 13:8, NKJV)

Therefore, those claims and teachings of the Catholic Authorities are false claimsand teachings, because they are not supported by the truth written on the Holy Bible. Any churches that will claim to be the true Church of Christ, must show proofs from the Bible that will support their claims because the Holy Bible is the only document that witness the existence of the true Church founded by Christ on the first century. They should also bear witness from Christ Himself and even from the Apostles, and most of all from God.