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I was clearly 'developed enough' to understand atheism at a young age, given that I was a notorious atheist at a Bible Belt school. Not exactly a viewpoint with a lot of popular support in those days.

But then I later realized that there actually is a God. (No, not Lucifer.)

Hopefully you will be 'developed enough' to come to a similar understanding yourself later in life.

Hint: atheism is what came first. Those are the "nephilim" tribes spoken of in the Bible. "In those days there were nephilim." It literally means "people without a belief in God." Religion was a higher level development.