"God's Not Dead" producer Russell Wolfe recently revealed that he was diagnosed with amyotrophic lateral sclerosis (ALS), also referred to as motor neurone disease or classical motor neuron disease.

The Pure Flix Entertainment managing partner made the announcement before completing the "ice bucket challenge" in a YouTube video.

"If you saw ['God's Not Dead'], then you remember that I played a doctor who told the patient that she had a terminal illness," Wolfe said. "What I didn't know is that shortly after that, I would be given the same news. I have ALS."

Wolfe then completes the challenge, and nominates three others to do the same.

"I challenge my business partners, Mike Scott, and David A.R. White, and also [actor] Kevin Sorbo," he said. "I'm calling you out, bud!"

The producer also had a spiritual message for the over 12,000 Pure Flix YouTube subscribers: "Remember, God's not dead, and He is good all the time."

Wolfe joins the actors, athletes, and celebrities around the world taking part in the "ice bucket challenge".

The "challenge" involves dumping a bucket full of ice and water over one's head, and then nominating someone else to take the challenge. Celebrities such as Justin Bieber, Taylor Swift, and Jimmy Fallon have all completed the challenge, on video, and shared it with their fans.

The ice bucket challenge is intended to raise awareness and money for ALS, a degenerative disease that affects nerve cells in the brain and the spinal cord, and can lead to paralysis in its later stages.

WFMZ reported that since the ice bucket challenge went viral at the end of July, the ALS Association has received $15.6 million in donations. Last year, the organisation received $1.8 million during the same period. Over 300,000 of those donations came from people who had never given to the charity before.