This isn't simply a disagreement. According to scripture, if you do not believe in the Lord Jesus for your salvation then there is no other method of salvation. All other religious systems of this world, be it Judism or Islam, no matter how kind or noble, are false systems devised to keep a person from sharing in eternal glory with Christ. One can have a very moral belief system (like the Mormons) but good works or moral values will not save. And if a dear friend was following a path to eternal torment, would you simply say that "You have your ideas, and I have mine. I just simply disagree with your views."?
As one who believes in the sovereign will of God in salvation choosing those who He wills to accomplish His will, I fully understand that many will not come to Christ. They think our message is interferring with their beliefs. Their minds are darkened to the truth. However, that does not excuse us from our obligations to follows Christ's command to tell them that 1) they need to repent, and 2) believe in the Lord Jesus for their salvation.
Ezekiel 3:18 When I say to the wicked, ‘You will surely die,’ and you do not warn him or speak out to warn the wicked from his wicked way that he may live, that wicked man shall die in his iniquity, but his blood I will require at your hand. 19 Yet if you have warned the wicked and he does not turn from his wickedness or from his wicked way, he shall die in his iniquity; but you have delivered yourself.
I was trying to be nice, but on reading what you said, I agree with your statement “According to scripture, if you do not believe in the Lord Jesus for your salvation then there is no other method of salvation. All other religious systems of this world, be it Judaism no matter how kind or noble, are false systems devised to keep a person from sharing in eternal glory with Christ.”
I nowhere or no way was inferring that the difference btwn Jews nor Muslims was just a matter of disagreement, for in context I was speaking in terms of degrees, not consequences. To die with just one sin means damnation, but as a matter of degrees, Sodom was not destroyed because their sin was that of not having a fence around the roof of new construction, but because their cry and sin was very grievous. (Genesis 18:20; cf. Ezek. 16: 49-50; Jude 1:7) And while one sin separates one from God yet there are those who (by God's grace) are obeying the light they have and are not "not far from the kingdom of God" as one who was a faithful Jew. (Mark 12:34) And Gentile Cornelius was yet lost, but was not as a wicked Haman as instead he was progressing toward Christ by obeying the light he was being given in God's grace.
Now no Jews are saved apart from Christ, nor are they overall as Cornelius, but the point is there are degrees of both personal iniquity and contrariness in belief, though all must come to even ground of the cross in penitential heart-purifying regenerating faith, thanks be to God. (Acts 10:43; 15:7-9; Titus 3:5)