der Sunnit
Sunni
A follower of Sunni Islam, the largest branch within Islam.
Die Mehrheit der Muslime weltweit sind Sunniten.
The majority of Muslims worldwide are Sunnis.

Sunni
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Sunni
A follower of Sunni Islam, the largest branch within Islam.
Die Mehrheit der Muslime weltweit sind Sunniten.
The majority of Muslims worldwide are Sunnis.

'Der Sunnit' (the Sunni) belongs to the N-declension. This means that the word takes the ending '-en' in all cases except the nominative singular. This is an important grammatical rule for this word.
Ich habe mit einem Sunniten über seine Religion gesprochen.
I spoke with a Sunni about his religion.
The adjective for this word is 'sunnitisch' (Sunni). It is used to describe things that relate to this branch of Islam.
Er besucht eine sunnitische Moschee in seiner Stadt.
He attends a Sunni mosque in his city.
The word derives from 'Sunna' (Sunna), a collection of teachings and practices in Islam. The ending '-it' is often used in German for followers of a particular doctrine or group.
Ein Sunnit folgt den Lehren der Sunna.
A Sunni follows the teachings of the Sunna.
Muslim
'der Muslim' and 'der Sunnit' both have to do with Islam. 'Muslim' is the general term for a male follower of Islam. 'Sunnit' is more specific: it refers to a follower of a particular branch within Islam. So you can say: a Sunni is a Muslim, but not every Muslim is a Sunni. The words can be confused when speaking about religion in general. If the exact branch does not matter, 'Muslim' is a better fit. If you are talking about the branch within Islam, 'Sunnit' is more precise.

In dem Text erklärt der Lehrer, dass ein Sunnit zu einer großen Richtung des Islam gehört.
In the text, the teacher explains that a Sunni belongs to a major branch of Islam.
Ali ist Muslim und geht freitags oft zum Gebet.
Ali is Muslim and often goes to prayers on Fridays.