It's important to understand that an atheist is someone who believes the scientific impossibility that nothing created everything. Some fundamental atheists will deny this by trying to redefine 'nothing' as being 'something,' because such a thought makes them look like a fool, which is precisely what the Bible says that they are

You Can Lead an Atheist to Evidence, but You Can't Make Him Think.

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.

It is embarrassingly unscientific to speak of anything creating itself from nothing.

This society in which we live is radically changing. What previous generations saw as evil is now embraced as being good. It is a dangerous and slippery slope upon which we stand when we reject what Solomon called the beginning of wisdom - the fear of God.

If Cancer is the chastening tool of God, then doctors who are fighting cancer are fighting against the work of God. If a preacher or a Christian believes the sickness is a means of chastening, then he should never pray for relief from the sickness, but rather pray that the cancer will continue to grow until the chastening is completed.

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.