[pinkpanther]

And no, our prophet did not force faith upon a people. I'm sure you know that it is foolish to force faith on anybody. You can force people to proclaim faith but you cannot force people to have faith. 

Please ask more if my explanation is not clear enough.

If the prophet did not force faith upon the people then why did he collect Jizya? Let's go to some Quranic verses and seek clarification..

Quran 9:29
Fight those people of the Book (Jews and Christians) who do not believe in Allah and the Last Day, do not refrain from what has been prohibited by Allah and His Messenger and do not embrace the religion of truth (Al-Islam), until they pay Jizya (protection tax) with their own hands and feel themselves subdued.

Allah (i.e. Muhammad) limited Jizya only to the “People of the Book” (i.e. Jews, Christians and Zoroastrians) in this verse, while polytheists were not even allowed to live after paying the Jizya. Polytheists either had to accept Islam, or they would be killed after 4 months (or till the end of their covenant). 

Imam Wahidi recorded under the Tafsir of verse 5:105:

Ibn 'Abbas said: “The Messenger of Allah sent a letter to the people of Hajar, whose chief was Mundhir ibn Sawa, inviting them to Islam, or to pay the Jizyah if they chose not to embrace Islam. When Mundhir ibn Sawa received the letter, he showed it to the Arabs, Jews, Christians, Sabeans and Magians who were around him.

 They all agreed to pay the Jizyah and disliked embracing Islam. The Messenger of Allah, Allah bless him and give him peace, wrote back to him, saying: 'As for the Arabs, do not accept from them except Islam otherwise they will have nothing but the sword. As for the people of the Book and the Magians, accept the Jizyah from them. When this letter was read to them, the Arabs embraced Islam while the people of the Book and the Magians agreed to pay the Jizyah.

I have a few more Quranic verses and tafsirs cited on faith enforced on unbelievers with death as penalty if they reject Islam...but I'm going to stop right here