The Ussher and other timelines are examples of making the incomplete and conflicting data of ages and lineages given in the text fit a pre-conceived idea, that being the Earth is was created by God and Adam placed on it in the Garden of Eden, and the date of the creation is therefore just prior to Adam's creation. Given that assumption, the biblical literalists and young earth creationist have invented a timeline that ignores the inconsistencies, fills in gaps, and basically plays hash with anything in the actual text.

Certainly reading a children's version of the Bible will result in a child's conception of what the text says. I remember learning similar dumb ideas as a child. But now I'm an adult and I've expanded my knowledge to adult understanding. Yes, when I was a child, I spoke, thought, and reasoned like a child. Becoming an adult means giving up those childish things and bringing one's fully mature thinking and reasoning.

Holding on to a childish version of Biblical stories and a childish understanding of how believers think does a disservice to intellectual curiosity.