What is the doctrine of the Murji'ah regarding the distinction between the terms "al-Din" (religion) and "al-Islam" (submission to God), and the difference between "al-Islam" and "al-Iman" (faith)?

It is known that the Murji’ah differentiate between the terms din (religion/faith) and iman (faith/belief), and between Islam (submission) and iman. Some of them say that prayer and zakat are not part of iman, and some say they are not part of din. Some differentiate between the names iman and din, and they say that deeds are not part of iman nor part of din. They say that din consists of three parts: iman is one part, obligatory acts are one part, and supererogatory acts are one part. They also say that Islam is superior because iman is included in it.