Here's another aspect I think you and some others here are missing. Your Catechism says that no one can be saved "who knowing the Catholic Church was founded as necessary by God through Christ". Yet, at another point it says there are some who have never heard that prerequisite but who CAN be saved if they seek after God and try to live according to the dictates of their religion, in other words, be a good person, live the "beatitudes". You now have an EXCEPTION to the Scriptural dictate that there is no other name by which we must be saved than through Jesus Christ. That ALL have sinned and fall short of the perfection of God, that without Christ we are at enmity with God, that whoever does not believe is condemned already because they believe not in Christ. There ARE no good enough works man can do to make him acceptable to God and it is only through the blood of Christ - received by faith - that anyone CAN be saved. Your very own Catechism contradicts what Scripture says - contrary to its assertion it is "basing itself on Scripture". Going by what it says, people would be better off NOT hearing about your Catholic church! We already know that true innocents are covered by the grace of God - something your Catechism agrees with. But those who have the knowledge of their sin and need for a savior, MUST come through Christ - HE IS THE DOOR.
Finally, I reject that the Roman Catholic Church is necessary for my salvation. It's not that I know it is and reject it, but I do not believe it is according to what Scripture plainly says. My salvation is based upon faith in Jesus Christ, the Son of God who died for my sins and was raised for my justification. It is only when one receives Christ that we become part of HIS body, HIS church. It sounds like the ignorance is with those who stubbornly insist what their church says about itself is ABOVE what God's word says - and there is no greater ignorance than that.
Your salvation is based on the Jesus that you came to know because of the Catholic Church and the Bible they gave the world. The Keeper and Protector of the Faith. The Catholic Church. Without the Catholic Church we would all still be praying to the sun gods and having human sacrifices.