A little old religious lady comes out onto her front porch every morning and shouts, “Praise the Lord!”
And every morning, the atheist next door yells back, “There is no God!”
This goes on for weeks. “Praise the Lord!” yells the lady. “There is no God!” responds the neighbor.
As time goes by, the lady runs into financial difficulties and has trouble buying food. She goes out onto the porch and asks God for help with groceries, then says, “Praise the Lord!”
The next morning, when she goes out onto the porch, she finds the groceries she asked for. Of course, she shouts, “Praise the Lord!”
The atheist jumps out from behind a bush and says, “Ha! I bought those groceries. There is no God!”
The lady looks at him and smiles. She shouts, “Praise the Lord! Not only did you provide for me, Lord, you made the atheist pay for my groceries!”