You raise good points that have been discussed on this board frequently. You’ll probably be interested in using the Search function at the top of the page to find threads on each of the points you raised. Most will lead you to the Apologetics forum. Some will take you to Liturgy and Sacraments. Others will take you to Sacred Scripture.
Reading through the threads you’ll find other members have raised your points rather eloquently over the years here. The answers to your questions will be in those threads and the good news is, you can always add to the discussions!
For the sake of keeping this particular thread ‘on-topic’ I’d like to respond to your previous post on this topic:
I agree with you that not everybody is meant to be Roman Catholic, just as I don’t believe that everybody is meant to be a Christian.
Scripture shows everybody is meant to be a Christian.
38 Then Peter said to them, “Repent, and **let every one of you **be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit. 39 For the promise is to you and to your children, and to all who are afar off, as many as the Lord our God will call.”
But my problem is why Roman Catholics would say that we’re saved, and we’re Christians, but we still need to become Roman Catholic.
Christians of trinitarian baptism are saved through that baptism, in that at that moment they enter into the family of God through Jesus Christ, His Son, and now, our brother.
Baptism is a rite of initiation into Christ’s church. It’s the beginning, but it is not the end. Jesus left other sources of grace to help us in our journey home to heaven. Those are the sacraments that you’ll find discussed frequently in those other forums I mentioned.
Is it just possible that we’re not meant to be Roman Catholics, but are meant to be Christians and that Christian churches are just fine?
Jesus established One church, and He directed the apostles to bring all people into it. Our mission is the same as theirs. All humanity is called to Jesus Christ, but not all will respond to the call. It is by the grace of God that any of us are saved but that doesn’t dismiss us from our mission to proclaim the Truth about Jesus Christ to all people.
For us Catholics, that Truth, is about the fullness of the church He established, inviting every person we encounter to receive the actual Graces He continues to bestow upon His faithful. There is no greater gift He gives to us than to receive Him - body, blood, soul, and divinity - through the Eucharist. He intimately gives himself completely to us through that sacrament and it is such a joyous moment we Catholics want all our Christian brothers and sisters to experience the true joy of receiving Him in that manner.
As for all Christian churches being ‘just fine’, well, why settle for ‘fine’ when you can have ‘excellent’? The Christian churches fulfill certain aspects of the Christian life but it is incomplete. There is so much more to being a follower of Christ. Jesus really is present in this day through the Eucharist. Christians of other denominations seem focused on Christ’s final return, as if He ascended into heaven on that one day and has been in heaven ever since. Catholics know without a doubt, through our experience of receiving the sacraments (particularly the Eucharist) that Jesus is here, now, in ever Catholic Church, in every tabernacle. We can sit with him, physically, at any hour of any day through eucharistic adoration.
We hear Christians ask, “What if Jesus was here today?”. The Catholic response is, “He is here.” We don’t have to imagine what it would be like to walk with Him, talk with Him. We do it at every mass.