Should We Partner with a False Teacher for Any Purpose?

Many Christians would rightly assume that any partnership with a false teacher is at odds with the teaching of 2 John 9-11, while fringe fundamentalists insist Christians should not even visit a restaurant owned by someone of a different faith. What is the difference between helping, aiding, partnering, and fellowshipping with a blatant heretic vs. living peaceful, evangelistic, intermingled lives with people in our community? Can we partner with false teachers if it's for saving America? If ...