Terry Hiebert, at Revive! EMMC Leadership Retreat, noted that within the EMMC there are both Calvinists and Anabaptists. He titled a presentation he lead "why can't we get along?"
(For working definitions of Calvinism and Anabaptism)
A place to start:
Admission that we do not know everything. There are still things to learn.
We learn from those who disagree with us.
If someone agrees with me completely I have not learned anything. There is no place for growth or deeper understanding.
This is not a winner takes all competition. The goal is not to defeat your enemies at all costs.
There are no enemies.
We are brothers and sisters.