Our part is to grow in Christ in the same way we become a follower, by resting and trusting Jesus to be our God. As we grow closer to God, we find that God truly is our Father, and Jesus our friend and brother. Be Wise Finding truth is a lot like walking on an iced-over pond. You may be completely convinced the ice will hold you, but if it's only a half-inch thick, you're going to get wet. But even if you have a few doubts, ice a foot thick will hold you once you walk on it.
Truth is like the ice.
You might sincerely believe in your ability to be good enough, or some sacrament, or even some religion to get you to God. But if it's not the truth you'll end up all wet. It may feel good to believe that there are many roads up God's mountain. No one comes to the Father except through me. There can only be one truth.