“The Qur'an is incomplete because it says it relies on a scripture “

The Quran is complete by itself. It does not rely on any other scripture. It makes references to previous scripture, but it does not need them. The Quran provides everything you need by itself.

“Muhammad traveled extensively from a young impressionable age and in those days the Psalms were widely chanted in public places.  Children are quick to learn songs.”

I grew up in a Christian evangelical society. I didn’t just travel there, I grew up there (here). I watched their shows on television, etc. The children I played with were all Christians. I didn’t learn anything about Christian scripture or doctrine until I started reading about it.

Travelling as a child, he probably didn't understand the language of the foreign lands. He also probably had little chance to interact with others since he was in the protection of the caravan.

Yes, Muhammad was perfectly knowledgeable on Jewish and Christian scripture. He could tell the Jews and Christian what was in their scripture better than themselves when they debated him.

But it was not from hearing or study. It was knowledge from God.

“as long as you notice that it says most of them... not all.”

The Quran describes the “not all” as those who have not yet heard the revelations given to Muhammad and who do not associate others with God (like the association of the trinity).

“I am certain there are evil-doers among the Muslims as well.”

The Quran describes them as the hypocrites (munafiq) who pretend to be Muslim, but are secretly aligned and friends with the enemies of the Muslims.

“I can find fault in Muhammad and his teaching and life.”

Fault based on what? Based on the satanic modern secular Western ethics? Or based on corrupted previous scriptures?

There is no fault in his life. He obeyed the real laws and ethics that God revealed to humanity.

All the prophets, Abraham, Moses, Jesus, Muhammad, etc, were equally righteous.

“he left much confusion by his words, or those attributed to him”

The confusion among Muslims is microscopic compared to the confusion among the early Christians, the Gnostics, the Arian heresy, Athunasius, and so many others.

Muslims may have disagreed on politics or minor ritual, but Christians couldn’t even agree on the oneness of God. Even among the trinitarians, there were many interpretations of what the trinity was, and is. Will you blame that on Jesus?

When Moses left for a few days, the Jews made a gold idol. Will you blame that on Moses?

The disagreement among Muslims was miniscule compared to the confusion left by prophets before him.

“Who is the author of confusion?”

Well, in the case of Christianity, the main culprit is Paul, the same one to whom the quote above is attributed.

I haven’t seen an ideology as confusing as the trinity, or things like Jesus was both begotten and eternal. So, since God is not the author of confusion, by your own premise, then God is certainly not the author of Christianity.

Anyways, it should say, “God is not the initiator of confusion.”

God deceived the Jews who thought they had crucified Jesus because the Jews had first deceived themselves by rejecting Jesus and convincing themselves that Jesus was a false messiah.

By having knowledge of the Quran, I am able to see what the Bible originally meant before it was tampered with.

God does is not an initiator of confusion, but God does cause further confusion as a punishment upon those who have first confused themselves by committing the sin of rejecting His message.

Christians first confused themselves by worshipping an image of Jesus which is not the real Jesus. Now, Christians have rejected the prophethood of Muhammad, and are immersed in the some of most debauched, lewd, Satanic, libertine, Sodomistic, opulent, and lascivious cultures in the history of the world. Thus does God send the evil doers even further astray.

“Who came and changed the word of God?  Who came preaching a different Gospel than the one that was taught?”

That’s the Jews and Christians.

We Muslims have kept the Quran just as it was revealed.

“the simplicity that is in Christ.”

And yet Christians, is he God, or the son of God, or both, or neither, or an image of God, or just a human temple where God resides, and on an on an on and on. Funny that Paul should preach simplicity while causing so much confusion.

Islam has an its appeal in its simple message: One God, Muhammad the messenger.

“For if he that cometh preacheth another Jesus”

Which is just what Christians do. They preach a false Jesus which they claim is God.

But even in that, the Christians are divided.

Islam preaches the original and true Jesus, a messenger of God.

8 How do ye say, We are wise, and the law of the Lord is with us? Lo, certainly in vain made he it; the pen of the scribes is in vain.

9 The wise men are ashamed, they are dismayed and taken: lo, they have rejected the word of the Lord; and what wisdom is in them?

The Law doth not profit you, neither need it to have been written for ought that you have learned by it.