Contention is from Satan because we all are born with Original Sin and it is the nature of man to have to find the Truth. Truth will have to be searched for....and that is where all contention comes into existence....what is the Truth? Of course, Satan tries to obscure the Truth and twist the Truth so all contention surfaces because Satan is trying to prevent our Salvation. So yes, Contention is from Satan.
It does not follow that argument is evil—not if it is to find the Truth. Debate and argument are necessary to arrive at the Truth—that has occurred throughout Christian history. That is what is so great about the Christian religion....and what led to all the creativity and genius and invention—the Socratic idea—that the obvious is not so obvious and that introspection and argument are necessary to find the Truth.
Are you trying to say that people who disagree with an idea are to shut up because there is no absolute Truth? That is total rubbish and unChristian.
That would lead to mediocrity, nihilism and stagnant societies who could never find the truth in anything.....science or God.