There are differences from the Trinity and the sign gifts. It is a heresy to deny the Trinity. All of Church history has stood in accord of saying that no true Christian can deny the Trinity and be a Christian. A Pastor, as well, should be competent in his doctrine to defend the Trinity.
The sign gifts are different. According to J.I. Packer, a large number of the Puritans, and perhaps a majority, were not cessationists. This issue is not a new one and it has come up throughout history. It has never been treated on the same plane as the Trinity and people who have disagreed have treated the others within acceptable differences.
I would invite him into my church, a church that believes in the cessationist doctrine. In fact, I do not think any of our Elders would disagree to having him preach.
I over stated my response to make a point.Yes, the trinity is certainly more substantial. That being said, thedoctrine of scripture is as important,because we do not get a true knowledge of God without His revelation of Himself.
Puritans looked for God to work in and among the people,but they were not looking for these falsehoods we see today.
Grudem, Piper, and several others get mentioned in these discussions.
They do not claim any sign gift themselves. I like some of the ideas they come up with on other areas.They are wrong on this however.