When you describe a garden, what doctrine is your foundation?
When you describe a man, what doctrine is your foundation?
Then, why would I need a doctrine, to describe the World?
Truth about things does not require any doctrine. Quite the contrary. Doctrine is your enemy in writing an unbiased text.
And I’m pretty sure, Luke did not think of doctrines, while writing what he’d written.
For starters, you don't seem to understand what I mean by "doctrine". From "The Random House College Dictionary":
Doctrine - "a particular principle, position, or policy taught or advocated".
Describe the World? When all is said and done, isn't the following your aim?:
"I want to show atheists, agnostics a way to Jesus."
You don't seem to have thought very much of this through. Perhaps you should take the time to do so.