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)
It is most difficult to measure "obeying the light". People thought the Pharisees were very righteous. Yet our Lord Jesus said that prostitutes and tax collectors were more righteous than they. Grant it, I do believe there are benefits from following the commandments. This is grace bestowed on all. So one could have a Jew and a Muslim all following the commandments. What does this get us? Are they really "obeying the light" or are they simply doing works to please God and further their own end?
I don't think one can compare one false religion against another. What value does it serve? All religions that denies Christ as the Son of God are designed to lead people away from the truth.