How in the world can you prove that your God influences the actions of people who contemplate him? Aren't hardcore Atheists not God's children? Aren't billions of Hindus or Chinese Buddhists not God's children?
You need to start by recognizing that all thoughts, words, and actions are controlled by cause and effect. Once you realize this, then you can start to figure out how you might influence all cause and effect, to see if you have any control whatsoever.
It can't be both badecker. It's either free will or not.