The Koran contains contradictions of consquence

According to the Koran, if there is a single contradiction in the Koran, then the entire Koran is in error. I sent the following list of contradictions in a debate and still await a response. I will give his answer in a future article. 1) Can Allah's decrees be changed? A) Yes Surah 2:106: None of Our revelations do We abrogate or cause to be forgotten, but We substitute something better or similar: Knowest thou not that Allah Hath power over all things? Isn't it funny that an all-wise, all-powerful, all-knowing God will have to bring something better or similar? Fact: perfection cannot yield imperfection; otherwise God will be imperfect. B) No Surah 6:34: "Rejected were the messengers before thee: with patience and constancy they bore their rejection and their wrongs, until Our aid did reach them: there is none that can alter the words (and decrees) of Allah. Already hast thou received some account of those messengers," Surah 6:115 The word of thy Lord doth find its fulfillment in truth and in justice: None can change His words: for He is the one who heareth and knoweth all. 2) Who was the first Muslim? A) Muhammad (p) 39:12 "And I [Muhammad] am commanded to be the first of those who bow to Allah in Islam," B) Moses 7:143 "When Moses came to the place appointed by Us, and his Lord addressed him, He said: "O my Lord! show (Thyself) to me, that I may look upon thee." Allah said: "By no means canst thou see Me (direct); But look upon the mount; if it abide in its place, then shalt thou see Me." When his Lord manifested His glory on the Mount, He made it as dust. And Moses fell down in a swoon. When he recovered his senses he said: "Glory be to Thee! to Thee I turn in repentance, and I am the first to believe." C) Abraham! 2:132 "And this was the legacy that Abraham left to his sons, and so did Jacob; "Oh my sons! Allah hath chosen the Faith for you; then die not except in the Faith of Islam," 3) Was Pharaoh killed by drowning? Was Pharaoh killed or not killed by drowning? A) No "We took the Children of Israel across the sea: Pharaoh and his hosts followed them in insolence and spite. At length, when overwhelmed with the flood, he said: "I believe that there is no god except Him Whom the Children of Israel believe in: I am of those who submit (to Allah in Islam). (It was said to him): "Ah now!- But a little while before, wast thou in rebellion!- and thou didst mischief (and violence)! This day shall We save thee in the body, that thou mayest be a sign to those who come after thee! but verily, many among mankind are heedless of Our Signs!" (10:90-92). B) Yes Moses said, "Thou knowest well that these things have been sent down by none but the Lord of the heavens and the earth as eye-opening evidence: and I consider thee indeed, Pharaoh, to be one doomed to destruction!" So he resolved to remove them from the face of the earth: but We did drown him and all who were with him," (17:102-103). I thank my partner for resolving to refute these errors. If you show me that Islam is correct I will convert. Until then, I believe these three contradictions are enough. Let's summarize:1) Are Allah's decrees changed?2) Who was the first Muslim?3) Did Pharaoh die by drowning?Thank you, good luck. :-)