It's kind of hard to say if God exists.
Some imply that mother nature is God.
Some wonder how one survives a crash in which a car is ripped to shreds.
I don't believe there is a God per se, but I believe there is some sort of supernatural force that provides us with guidance.
I'm a mix of two different religions, and I studied religions and faiths for a year.
Jewish people regarded Jesus as a fraud, and didn't believe he was the messiah. They are still waiting.
For Christians, their messaih was born, died, and rose from the dead to reside with his father, God
For Mulsims, Allah is God, Muhammad similar to Jesus
For Hindus, there are many Gods/Goddesses, but they believe in the master God who created everything.
For Buddhists, God doesn't quite exist, but they stemmed from Hinduism, and they believe the true goal in life is to achieve enlightenment.
To each their own...
When it comes to the end, that piece of chalk that did not break, instead broke the professor. It could've been a coincidence, it could've been God (or supernatural force).
If you carefully think about it, perhaps maybe the professor could've claimed he was an Atheist, but look what happened when the chalk broke?...