"the devil may become evident as a weapon , a weapon designed and used time and time again in every age to wip men into a surrender to a particular chruch or church state. . . .
The suthor is saying that they used the curch to their benefit once in a while to get people to do what they want. People int his age where so religious if you said anything about witch craft and the devil they would ban it or avoid it. So they felt that combinding church and state was good because you could controal the people and what they did in the state all by what the church had to say.