It is true that you can't prove a negative. However, the existence of God is provable in the same way a building is positive proof that there was a builder.

Every song has a composer, every book has an author, every car has a maker, every painting has a painter, and every building has a builder. So it isn't irrational to take this simple logic a little further and say that nature must have had a Maker. It would be irrational to believe that it made itself.

So we are mocked by this world when we speak of God's coming judgment against all sin, and when we plead that sinners come to the Savior to avoid Hell. But we can't give up because our task is irksome, or because we are mocked. Neither can we live self-indulgent lives, because our convictions aren't based on some man-made and fallible calculations. They are based on the immutability of the Word of God.

Put legs to your prayers

Christians must share their faith in obedience to the Great Commission, because we are only seeing the fruit of sin this side of death.

Even Helen Keller, who was born blind and deaf, could see God. No doubt, in her silent darkness, every fragrant flower, every ray of the warm sun, every taste that touched her tongue told her that there was a God who created all things. Jodie Foster shouldn't therefore be surprised that people are surprised that she's an atheist.

A blind, anemic, weak-kneed flea on crutches would have a greater chance of defeating a herd of a thousand wild stampeding elephants, than the enemy has of defeating God.