Yeah, the ancients wrote all their wisdom into religious texts... however they also wrote in a lot of nonsense. If you consider that most writing of the times was done in a religious context, the appearance of wisdom in a religious context does not hold much weight as far as shwing religion to be good, when there were no other contextual options available for writers.

Most early Christian writers relied heavily on and borrowed from the Greeks for their wisdom, which was mostly written outside of a religious context.

Lacking behavioral sciences such as psychology or sociology, religion was the only outlet for wisdom regarding mankind for early writers.

Any competent propagandist knows that you need to leaven your spin with some identifiable truth in order that it gets accepted without too much scrutiny.

With respect to your statements I believe you've chosen the right platform to express your ideas and preferences to people who will honestly give you their unbiased opinions. Whether they agree with you or not is a chance you must be willing to take in your personal search for truth.

Meh. Read Kant or Hobbs for insight on human behavior. HS classes in critical thinking would help with common sense (which is never very common). One doesn't need religion for that so religion remains useless. It's actually dogmatic religion which I find more useless than those which offer productive practices, like meditation or yoga, but even Buddhism has its Deities. Strip those out and you've got something of value.
There are no such things as open minded believers. That's what makes them believers. Sometimes an argument can create a wedge within the mind of someone who is not an ardent believer, only believes that they are, and it's those folks one tries to reach. That's why books like Age Of Reason are dangerous to such communities.