Is Islam the only correct religion? What about those good people of other religions?
Is Islam a Noun or a Verb?
When we say “Islam”, what do we mean? Is it simply a label that some people claim, just like being a scout or a member of a political party? This would make Islam a noun. Perhaps this is not correct. Perhaps Islam is actually a verb, a process. So when someone encourages the good and avoids the bad, they are “Islamic”. So when we look at the Prophets mentioned in the Quran, they existed at a time when the word “Islam” had no meaning, yet they were “Islamic”, as they practised the values and principles of Islam.
Quran on other faiths
2|62|Those who believe, and those who are Jewish, and the Christians, and the Sabeans—any who believe in God and the Last Day, and act righteously—will have their reward with their Lord; they have nothing to fear, nor will they grieve.
5|69|Those who believe, and the Jews, and the Sabians, and the Christians—whoever believes in God and the Last Day, and does what is right—they have nothing to fear, nor shall they grieve.
The Quran suggests that anyone who believes and does good will be rewarded and not disappointed. Again, if we take the view that Islam is a verb, then those who believe and do good are actually doing Islam, even if they claim a different religion for themselves.