Wait, wut?
Since when was it ever 'rude' and 'demeaning' to tell someone to witness to the lost?
My, what strange times we're in.
He wasn't saying that he was saying even the nicest Muslim is lost. It was a personal opinion rather than one supported by any Scripture. Abraham had 1 God, not two or three or four, 1.
Saying another person is not saved is only one way of a few ways a believer can lose their spot in the 1,000 year reign. The other is being a false Christian, that would also include any person who eats and meat that was sacrificed in a religions ritual. If this one doesn't grab you the NT verses. This is used as it covers the 12 Tribes as well as all Christians. After Xmas and Passover how many of those two groups would be left alive. Christians should be more concerned about their own house and keep their nooses out of where it doesn't belong as they do not have a very good understanding of the Bible, even more so for the 12 tribes that reject the NT as being less that their OT.
Isa:66:3:
He that killeth an ox is as if he slew a man;
he that sacrificeth a lamb,
as if he cut off a dog's neck;
he that offereth an oblation,
as if he offered swine's blood;
he that burneth incense,
as if he blessed an idol.
Yea,
they have chosen their own ways,
and their soul delighteth in their abominations.
1Co:5:9-11:
I wrote unto you in an epistle not to company with fornicators:
Yet not altogether with the fornicators of this world,
or with the covetous,
or extortioners,
or with idolaters;
for then must ye needs go out of the world.
But now I have written unto you not to keep company,
if any man that is called a brother be a fornicator,
or covetous,
or an idolater,
or a railer,
or a drunkard,
or an extortioner;
with such an one no not to eat.
Would there even be 1% of them left if that judgment came down today?
