According to the "Athanasian Creed", "Whosoever will be saved; before all things it is necessary that he hold the Catholic faith.
But, according to the Word, it is necessary to believe on the Son of God to be saved:
"And brought them out, and said, Sirs, what must I do to be saved? And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house." Acts 16:30-31
"He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him." John 3:36
"Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life." John 5:24
Where in the Word of God does it say that in order for someone to be saved, they must adhere to the Catholic Church? Read the catechism, it speaks not according to the Word of God(Isaiah 8:20). The reason why there is so much confusion is because of the modern "versions" of the Bible. No Christian should be supporting the Catholic church, because they are sending multitudes to the lake of fire. Every Christian should be witnessing to that group, because they clearly have half-truths but not the entire truth. They pervert the simplicity of the gospel which will send many to hellfire. I dont say this to be unkind, I say this because I care for people who are being lulled into a false Christianity such as the Catholic religion. Every Christian that supports groups that teach ****able heresy will be accountable to God one day for it.