I would say this regarding non-Judeo-Christians:
Everyone can reach certain parts of the summit without faith: everyone can use reason to reach certain truths (like the existence of God). So knowledge of God is available to all, as the Apostles writes (in his letter to the Romans 1:19-20),
Even then, few of those limited to reason would be able to reach the Truth. Many got lost: they went in a direction that lead far from the Truth. So even then, finding these Truths through reason alone was a very difficult task.
However, God has set aside a people, a people who, although they have been weighed by great responsibility, have also been given certain privilege. Israel has been given knowledge of the True God, knowledge that could not even in principle be found by reason, but rather only by a Revelation. They not only recognize the True God, but they have entered in a relationship (read: covenant) with Him, and thus, just as spouses are only allowed to know one another, so only those who are a part of this covenant are given knowledge of the True God. I remind others though: after the Messiah came, God changed the form this covenant by: 1) deepening it, 2) making it salvatory, and 3) opening it to the Gentiles. Now, although the Jews were saved first (they are the Guests of Honor at the Wedding Table), those who were only able to know God through the world can now know Him directly through the Holy Spirit.
Because of this Divine Revelation, those who accepted His Grace can help those limited to reason find these Truths, for they have been revealed. When it comes to Truth that can be known through reason, Divine Revelation is like the answers at the back of the book, which can be used to guild reason so that it won’t go off track. One can even go farther, in that by reaching the truths knowable by reason, by reason, it will become easier for one to accept the gift of Faith and take the next leap.
God is revealed to everyone in every culture. The problem is that humans being fallen, have misunderstood what has been revealed to them. To use your analogy, those in a weak relationship with me will only see parts of me, and thus fill in what they haven’t seen or misunderstand what they have seem. On the other hand, when I give my mind, life, and heart to my wife (if I had one :crying: ), she would see every part of me: she would see me as a whole, as I would give her everything that is me (if I am a perfect lover

). Because she sees me like this, she is now able to understand me completely, won’t have misunderstandings since I will guild her through them, and won’t need to fill in any details. The weaker relationships are like those between God and the Gentiles, the relationship between the spouses is like the relationship between God and Israel. Since God is Love, He is the perfect Lover, and thus gives Himself completely to His beloved, Israel. Israel, on the other hand, is given complete knowledge of God so that She will not fall into the errors of the Gentiles, with their ignorance. Jesus the Messiah has come and opened this spouse-like relationship to Gentiles as well as Jews, so that they can strengthen their relationship with God. The Church, who is the new Israel, has this knowledge of God, and so clarifies it when She needs to (this is called the Magisterium, aka “the teaching Authority”).
This is why the Apostle also says (in his first letter to the Corinthians 9:22):
and from St. Luke’s Acts of the Apostles, chapter 17, line 23:
The Apostle to the Gentiles knew that the Gentiles had an imperfect relationship with the True God, with their misunderstandings coming from their culture and the like. So, he decided to find the aspects of God that have been revealed to them, and show them where they’ve gone wrong with misunderstandings, and then to take them on the Right Path, filling in the rest with Revelation.
He could only be “everything by turns of everyone,” because the Gentiles had an incomplete knowledge, while he had complete knowledge. Since he was complete, he could emphasis in himself what the Gentiles have been given, so that they would realize that he has everything they have, and more. And thus be converted.
I hope this post makes sense, because it took a while to write, and I’m not sure whether what I am trying to show you came out clearly. I kind of just wrote down my thoughts, which even confuse me
Christi pax,
Lucretius