Koran is full of contradictions and errors

Quran is full of internal contradictions, scientific errors and
historical blunders. 54:19 mentions Aad was destroyed in a day but
69:6,7 mentions Aad was destroyed in seven nights and eight days;
19:17 shows an angel appeared to Mary but 3:42 shows several angels
appeared; 28:40 mentions pharaoh drowned and died but 10:92 states
that the same pharaoh was saved; 18:86 states that sun sets in a muddy
spring of water; 15:19 mentions earth is flat; 86:6,7 states that
semen emits from between back-bone and the ribs; 19:27,28 states that
Mary was the sister of Aaron, whereas history shows they were born
about 1300 years apart; 28:8 tells that pharaoh and Haman were living
at the same time and place whereas history clearly shows they were
born about 1000 years apart and pharaoh lived in Egypt and Haman lived
in Shushan city in Persia; and 4:157 says that Jesus was not crucified
whereas it is crystal clear in historical records that Jesus was
crucified and not another man who looked like Jesus. By the way, the
transliterated name of Jesus in arabic Quran is Isa but even this is
wrong because the name of Esau, brother of Jacob (Yaqub in arabic) is
Isa in arabic. The correct transliterated name of Jesus in arabic is
Yasu. Isa (Esau) means 'hairy' and Yasu (Jesus) means 'God saves.'
source: http://islam-watch.org/LeavingIslam/Why-I-Quit-Islam.htm