Almost everyone, Christian or otherwise, is familiar with the Biblical narrative of David and Goliath. The lesson it teaches is that no matter the odds against God's people, He will give them victory when they place their unrelenting trust in Him.
The other thing about the story is that David knew his enemy and was therefore able to stand before him and conquer him in the power of the Lord.
Unlike David, Christians today are confronted with a mammoth Goliath of which the overwhelming majority are totally oblivious. In fact, they find themselves in this position because they are fighting on the enemy's side. You are invited to join a movement, a David compared to Goliath, to stand for the God of creation in the final battle of the Conflict of the Ages.