In response to Kaiser's post, I am forced to bring up this topic:
And it just doesn't add up: Sura 4:11-12 and 4:176 state the Qur'anic inheritance law. When a man dies, and is leaving behind three daughters, his two parents and his wife, they will receive the respective shares of 2/3 for the 3 daughters together, 1/3 for the parents together [both according to verse 4:11] and 1/8 for the wife [4] which adds up to more than the available estate. A second example: A man leaves only his mother, his wife and two sisters, then they receive 1/3 [mother, 4:11], 1/4 [wife, 4:12] and 2/3 [the two sisters, 4:176], which again adds up to 15/12 of the available property.
How many angels were talking to Mary? When the Qur'an speaks about the announciation of the birth of Jesus to the virgin Mary, Sura 3:42,45 speaks about (several) angels while it is only one in Sura 19:17-21.
Further numerical discrepancies Does Allah's day equal to 1,000 human years (Sura 22:47, 32:5) or 50,000 human years (Sura 70:4)? --- How many gardens are there in paradise? ONE [as stated in 39:73, 41:30, 57:21, 79:41] or MANY [18:31, 22:23, 35:33, 78:32]? --- According to Sura 56:7 there will be THREE distinct groups of people at the Last Judgement, but 90:18-19, 99:6-8, etc. mention only TWO groups. --- There are conflicting views on who takes the souls at death: THE Angel of Death [32], THE angels (plural) [47] but also "It is Allah that takes the souls (of men) at death." [39]
Angels have 2, 3, or 4 pairs of wings [35]. But Gabriel had 600 wings. [Sahih Bukhari, Volume 4, Book 54, Number 455]
How many days did Allah need to destroy the people of Aad? One day [54] or several days [41:16; 69:6,7]
Six or eight days of creation? Sura 7:54, 10:3, 11:7, and 25:59 clearly state that God created "the heavens and the earth" in six days. But in 41:9-12 the detailed description of the creation procedure adds up to eight days.
Quick or Slow Creation? Allah creates the heavens and the earth in six days [7] and many Muslims want to be modern and scientific, and make that six eons, but then again, He creates instantaneously [2], "Be! And it is".
Heavens or Earth? Which was created first? First earth and then heaven [2], heaven and after that earth [79:27-30].
Calling together or ripping apart? In the process of creation heaven and earth were first apart and are called to come together [41], while 21:30 states that they were originally one piece and then ripped apart.
More at: http://answering-islam.org/Quran/Contra/index.html