" Are we being honest in acting as though we're unrelated to other Christians?"

Being related to other Christians is light years from some affinity to the Muslim faith. It is a false dilemma to equate the two concepts as have some relevant parallel.

The Muslim faith has no affinity to Christanity. If the RCC is antichrist for a false Christanity, Muslims are blatant heathen and must be dealt with on this basis.

Paul never said to the Gentiles, your faith is like our faith, all we need is some understanding and a little "tweaking" of your faith to be in harmony with Christanity.

The devil is creating a one world religion and more than a few SDA's don't know up for down in what constitutes true bible faith.

Everybody is a candidate for heaven and should be treated accordingly. But patronizing is not a viable method for evangelism.