I wasn't aware that Islam in general, or even specifically the Qur'an, addressed the issue of non-Muslims (except in reference to us Dhimis being mostly "left alone", beyond the head-tax). Does Islam have a "place" and purpose in Allah's Plan for people to remain non-Muslim?

The concept of the Noahide Laws is that non-Jews, have no need to become Jewish, to be "found worthy" and get their due reward. All that is required of a non-Jew is to observe these seven most basic rules, to be considered righteous before G-d. I'm pretty sure this type of "universalism", while likely not unique to Jewish Thought, is NOT present in either Christianity or Islam. Care to correct me?