Salam Brother Student
I would expound knowingly=come in contact (whenever/wherever), unknowingly=news never reached them - hope you agree?
Yes I agree, but I would like to add that 'unknowingly' would also include people who are genuinely not convinced of the veracity of the Quran. These people are not doing this out of malice, their hearts are not simply convinced yet.
I would humbly argue, to these awesome people (if) God is sending them back to Books (it is) with confident not so much as with discernment, simply because
God sends them back to their books with a tool to discern between truth and falsehood, the Quran. God tells us in the Quran that the plurality in shariah is a part of His plan for us. This is God's decision, we have our shariah in the Quran, they have theirs in their books. This is very evident in the Arabic Quran. God is the one sending them back to their books with a verification tool, they are expected to go back to their beliefs. It is not about what they would want. Wants and desires have no place, when God has spoken. What God expects and wants is of utmost importance.
1. These people after having shaken to the core by just listening the recitation of few verses whose hearts have been deeply moved and penetrated with pure light are hardly imagined/expected to go back to anything else and anything less rather they develop a deep burning and intense desire to know and hear more
Brother, the parts of their books, that are confirmed is what makes them see the truth in ours. Their eyes overflow because they know that the Quran is also from the same God. Previous books and the truth in them is also capable of bringing tears to a believer's eyes and make them awestruck. This is a fact. There are multiple, beautiful verses in the Torah which are confirmed by the Quran, that is awe-inspiring. They are asked to read the Quran and then use it to discern the material found in their books. They would have to go back, because the Quran simply asks them to go back.
In fact, the Quran actually, reprimanded a few of them when they came to the Prophet Muhammad for law. God has clearly then said, that the Torah is in front of them, therein is the command of God. Why are they visiting the Prophet? These are unbelievers.
God expects them to not abandon their books. They are to consider their books with the help of the Quran.
If, still one of them wants to only follow the Quran, then it is their choice. I cannot say anything about this. But, the Quran does say that salvation is open to anyone who believes in one God, Judgement Day, and does good deeds. Ultimately, all of us will return to Him and He will judge.
2. And so when they come across 2:38, and all of 6236 verses they feel not out of choice but gladly embrace the pure and pristine word of God, the Quran and its Law
It is not about feelings and wants brother, a lot of people feel compelled to sin, we cannot get away by saying we felt like doing something. It is all about what God wants. At the end of the day the choice is theirs, but the Quran expects them to follow their own shariah. This is what God is telling them to do. If, they want to follow the Quran only, it is their choice, one they would have to justify to God as well.
It is good that you are doing your own research and reading the scriptures yourself brother. May God guide us all to the straight path.
God Bless