6 Questions about Christianity w/ Reciprocal Answers

do you Christians wanna answer these 6 questions I have about your Christian beliefs?
to be fair, I'll also give 6 reciprocal answers from me.

>1) Does it matter for your belief whether or not the NT was written by eyewitness disciples of Jesus?
>2) How do you know and authenticate that Jesus said what you understand him to have said (such as in the NT version you accept)?
>3) How do you know that your beliefs in Jesus are good or bad?
>4) Is the NT or bible the preserved word of God, and does that preservation have consequences for Christian theology?
>5) If 1)&4) [NT from eyewitnesses? NT/Bible preserved?] are demonstrated as false, what is your foundation for belief in 2) whereby you base your theology?
>6) What are you as a Christian supposed to do when one comes to you claiming to be a Prophet?

reciprocal answers from me, a Muslim:

1) Yes, it matters that the Qur'an and authentic ahadith are recorded by sincere, believing eyewitnesses

2) We have a science for this, ilm al-hadith, ilm al-rijal, & the isnad that demonstrates who witnessed and transmitted narrations of the Qur'an and of the Prophet ﷺ,
& science for interpreting the Qur'an based on the teachings of the Prophet ﷺ to the Companions &how it was understood by them and the generations after

3) the Qur'an is demonstrated as a revelation from God Almighty, and claims it is from God Almighty,
& the Prophet ﷺ is demonstrated as a sincere and truthful Messenger from God.
It is a Criterion sent in truth, to judge between good and evil, and a Confirmation of what was sent before it

4) Yes, even non-muslim historians testify that the Qur'an is preserved.
The Qur'an claims it would be preserved, & we have comprehensive evidences and sciences for authenticating and demonstrating the preservation & transmission of the Qur'an from the Prophet ﷺ to the Companions and the generations following.
There are millions today who have memorised it entirely, in the way it was revealed originally.

5) The basis of our theology is "la ilaha illa Allah ; Muhammad rasul Allah"
that there is none worthy of worship except God Almighty, and Muhammad ﷺ is the Messenger of God Almighty,
and for us 1)&4) are demonstrated as true.

6) The Prophet Muhammad ﷺ is demonstrated and proven to be the last messenger and prophet of God Almighty, so we know that whoever comes after him ﷺ claiming prophethood is false.
Muhammad ﷺ delivered, among many prophecies & miracles, the greatest miracle, the Qur'an,
and is demonstrated that he ﷺ was truthful&sincere and could not have been deceived, delusional, or dishonest.
The Prophet ﷺ came with clear signs and teachings, and shunned & freed us from evil & falsehood, and demonstrated the truth from God Almighty:
that God, the One and Only, is deserving of all worship & praise.