I am currently reading Reasonable Faith by William Lane Craig and in chapter 2 (The Absurdity of Life without God) he says that life without God is without meaning/significance, value, and purpose.
I'm currently struggling a bit with finding the difference between meaning and purpose.
So far, here is what I've come up with:
Why are we here? Why did God create us? Answer: To worship Him!
What is the goal of life? What are we here to do? Answer: Decide our fate for eternity.