I think, because G-d is so infinitely vast and pure and powerful it is hard for any of us to grasp what He truly is. He wants to show His greatness through grace, mercy, and forgiveness--unconditional love. Yet He also wants to share with us His nature.
If he wanted to reveal himself, why is he playing hide-n-seek with us? Wouldn't it be more reasonable for him to wave to us from heavens and make sure we have real reasons to believe instead of not providing any good evidence for his own existence?
There is a book, written by a once harsh skeptic of the Gospel, whose name is Lee Stroebel (https://www.amazon.com/Lee-Strobel/e/B001H6KH8G) if should want to see some rational reasons for believing in Christ as G-d.
I'm curious, which of Lee Stroebel's reasons do you find convincing?