Theory number 3.

[Mystic]

This is only minorly connected to the OP, but I am of the opinion that you can learn art with the right instruction. Math, too.

Maybe it's also possible for all humans to know God too. But it's not entirely their fault or their fault at all if they don't (various factors influence them not to use that power of sight).

Maybe it takes some intense "longing" to "see" or to "know" God exists, and some people feel satisfied not knowing. Or perhaps it takes "patience" to hold on to this knowledge, since it cannot be inferred from argument and doesn't have a constant application in the real world, as does logic or art or morals.

Anyways, I'm going to say, I really don't know why Atheists don't believe in God. I understand there is a lack of evidence and that is a factor, in the sense, if there was evidence, Atheists would believe.

When people originally believe in (objective) morality, they do so without thinking about why they do....they simply do. But then a lot will never use their faculty of seeing morals but simply follow culture.

In the case of math, there can be a lot of practice. But in the case of "seeing" eternal praise/glory/greatness/ultimateness, we aren't really applying this knowledge or practicing it.

I would say perhaps a way to practice it, is in an sense of pride of the originality of the soul, and therefore witnessing the sacred origin of the soul. If you constantly take pride in that perception, it would constantly be applicable.

Or if you would constantly want to summon a spiritual power within the soul, to overcome negative thoughts, and you see the spiritual power link to the "eternal" or it's "eternalness" or "origin" and that constantly helps you, you constantly are putting into practice that knowledge.

However, how would a person who doesn't perceive "see" and "practice" to see. I don't know.

Questions of how to overcome doubt, is a good question. I know in Shiite hadiths, doubt of God was seen simply to be through the impurity of the soul, while the purity of the soul knows God exists. And it's a struggle between the impurity and purity.

I don't think that is a true, but perhaps there is "negative" thoughts, that need to be overcomed.