Is every part of the quran written in first person from Allah?

Oh come on everyone knows the truth that Islam and the Qur’an is a mere 1,400 year old badly re written version of the 2,000 year old Christian religion!

Whilst imitation is said to be the sincerest form of flattery no imitation can ever be better than the original

Angel Gabriel sent progressively to prophet Muhammad, each year angel Gariel tutored him in memorizing.

And it's Memorized directly by thousand f comppanion, and cross checked each other while it's being written.

The words of the Quran were collected as they were revealed to the Prophet Muhammad, committed to memory by the early Muslims, and recorded in writing by scribes. As the Quran was being revealed, the Prophet Muhammad made special arrangements to ensure that it was written down. Although the Prophet Muhammad himself could neither read nor write, he dictated the verses orally and instructed scribes to mark down the revelation on whatever materials were available: tree branches, stones, leather, and bones. The scribes would then read their writing back to the Prophet, who would check it for mistakes. With each new verse that was revealed, the Prophet Muhammad also dictated its placement within the growing body of text.

Is the message important or it's author?

The Quran was memorized by Muhammad; his followers wrote down the Quran IN MUHAMMAD'S LIFETIME in fragments. These were pieced together after Muhammad died. The Quran is the direct word of Allah, given through the archangel Gabriel. (THE SAME ANGEL THAT APPEARED TO MARY). The Quran has NEVER been changed from its original Arabic--the language of God. The Quran is exactly the same as it was 1400 years ago.

Christians have no problem believing that the archangel Gabriel (aka the Holy Spirit) appeared to Mary; why do they have a problem with Gabriel appearing to Muhammad?

Yes. But 1500 years ago. Weve evolved since them, Baha-u-llah came 170 years ago with teachings for today.

The quran was not even written by Mohammed himself. The Quran was written after the death of Mohammed