You're absolutely right. We've posted reams of scripture and explanations from every angle, but to no avail. This false gospel of love and peace saves no one. Only the father of lies could invent such a devious weapon against the truth: "Surely you will not die, for god knows that... you will be like divine beings" (Genesis 3:4-5, NET).
Satan fears the Truth and will stop at nothing to silence it. He'll dress up as a Christian and lull us to sleep with soothing words, saying "There is no danger, those people are just full of hate and bitterness. Just keep repeating the 'love' mantra and they'll come around. But the most important thing is to get them to stop reading that primitive Book!"
Either of you ever read "The Screwtape Letters" by C. S. Lewis?