Please forgive me for pitching in,
@paarsurrey , but I think this may be helpful despite my own suspicions that you would rather have me keep my silence on this matter.
Islam, as most any other group or religion of comparable size, is divided in many different movements. One of those, notable here in "the West", is that of Ahmadi Muslims.
From my experience Ahmadi Muslims do not seem to like to emphasize that they are a separate group from the globally more noticeable Shia and Sunni (or even Sufi) Muslims, and it is possible that they do not even perceive themselves as such. Muslims as a whole seem to be particularly troubled by the human conflict between the needs of belonging to a greater whole while also craving to be unique and individual.
In any case, the movement began in the 19th century and is, at least arguably, a heresy of Islam and also a reformation of it. Its founder claims to have fulfilled the prophecies of Islam, and as most Jews will tell you, people who claim to have fulfilled prophecies tend to be... difficult. From their own perspective,
Ahmadiyya Muslims seem to believe themselves to be a necessary and legitimate renewal of Islam and not a splinter group as such. I suspect but do not know for a fact that they expect Shias and Sunnis to eventually convert to their beliefs.
Then again, there are hints that many or most Muslims do not expect even other Muslims to particularly like to discuss matters of belief. I almost get the sense that they expect God or the Qur'an to simply inspire those who disagree with them to eventually change their minds. And that in casual conversation it is not very easy for Muslims to suggest that each other's beliefs may be mistaken.
