[Ali Imran]

I'm referring to Surah Al-Ma’idah Ayat 47 (5:47 Quran)
and Sunan Abi Dawud 4450

Yusuf Ali
Let the people of the Gospel judge by what Allah hath revealed therein. If any do fail to judge by (the light of) what Allah hath revealed, they are (no better than) those who rebel.

The Jews and Christians were to be judged by their own books according to the Quran...so why did Muhammad enforce his own laws on them..in the Hadith Sunan Abi Dawud 4450

The Prophet (ﷺ) said: So I decide in accordance with what the Torah says. He then commanded regarding them and they were stoned to death.

You see that the prophet is using the Torah to pass a judgement on a Jew and not the Quran...so why did he further enforce unbelievers to convert, pay a jizya or face death if the scriptures say that people of the book follow the laws of their books since it is revealed by Allah?

https://sunnah.com/abudawud:4450

Quran 5:47 and a few preceding verses tell us about the mentality of the children of Israel, similar to the Quranic stories that tell us about the mentality of the people of Noah or Abraham, peace be upon them. It is not a command or injunction for the followers of Prophet Muhammad صلي الله عليه وسلم but a lesson for us.

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.