It should also be known that Jahm ibn Safwan himself, the one to whom the Jahmiyyah Cult is ascribed, was a common man with no Islamic knowledge. It was only after debating with atheists in attempts to call them to Islam that he developed his line of thinking and began to spread it and then became popular. The wicked beliefs of the Jahmiyyah have since plagued the Muslim Ummah for over 1,300 years and they have been the reason for some of the worst trials in the history of Islam! All of this came originally from an ignorant man with no Islamic knowledge! So we must not underestimate the level of harm that an ignoramus can create, even while he intends good.
Source: Ten Brief Responses To Ten Recent Claims About the Informative PDF By Moosaa Richardson, pages 7-8.