Fuller rightly responds to people who want to be part of a broad religious group without a commitment to their local church. It seems the problems we face today existed in Fuller’s day just the same. The following entry comes from The Works of Andrew Fuller, III:797.
“There appears to be a mistaken idea, to commonly prevailing in the religious world at present, respecting what is called a party spirit. Many professors, while they endeavour to promote the interests of religion in general, too often neglect to pay that attention which id due to the interest and welfare of that class or denomination of Christians in particular with which they are or have been connected. It is not uncommon to see one of these “candid” Christian professors keep at a distance from his own denomination, or party, where that denomination stands most in need of his countenance and support; while he associates with another pat, which is sanctioned by numbers and worldly influence. And when the inconsistency of his conduct is hinted at, he will excuse himself by saying, in the cant phrase of the day, That it is his wish to promote the interests of religion in general, and not to serve a party. I wish some of your correspondents would expose the conduct of such fawning professors i its true colours; and endeavour to convince them that in vain are all pretensions to Christian candour where consistency and integrity are wanting.”
Working out Salvation with Fear and Trembling 