Yes Mohammaden is a wrong word, as Muslims don't worship Prophet Mohammed(PBUH). Muslims is the right word, because Muslims are followers of the last divine and final message of one true God. The followers of previous propehts like Noah, Jesus, Moses(etc)(PBUH) were all Muslims as long as they stuck to true teachings.
Muslims respect and revere Prophet MOhammed(PBUH), but don't worship him as christians worship Jesus and attribute divinity to him.
First of all understand the proper meaning of words and write here. Kafir - means the one who conceals, (kafir in Islamic context means the one who conceals the oneness of Allah and associates partners with him) In a general term, a farmer is also a kafir as he conceals seeds inside soil.
Shirk -- means worshipping or associating partners with Allah, as christians do by making Jesus his Son, which is an outright lie.
Dhimmis - the ones who are protected. They pay jizya and they are the under the protection of the Islamic state.
Also someone who can worship a human and assigns divinity to mortals can never understand the personality of Prophet Mohammed(PBUH). There was none like him and there will be none like him in the future..
