“and Mormon missionaries will be showing up at Christian homes capitalizing on this and selling Mormonism as Christian.”
I gave at the office.
Treating all as a Brother is what Jesus implored the dogmatically correct Pharisees with the parable of the good Sumaritan (the theologically heretical fake Jew). It doesn’t mean you agree with doctrine, but you are required by Jesus to show good will.
The new commandment from Jesus is to love one another as he has loved us. I see it rarely here on Freerepublic, therefore I can only conclude that the true disciples of Christ are faint in numbers here.