Noah and his son:
The author of this claim has a difficult time understanding the Noble Verses 21:76, and 11:42-43. He claims with his own words by saying: "the Qur'an even admits that this can be something rather difficult to comprehend for normal human beings, even for the prophet of God, Noah." After carefully examining the Noble Verses above, I find that the author has a problem comprehending simple sentences in the Noble Quran or in any book in general.
Let us look at Noble Verse 21:76 "(Remember) Noah, when he cried (to Us) aforetime: We listened to his (prayer) and delivered him and his family from great distress."
Let us look at Noble Verses 11:42-43 "So the Ark floated with them on the waves (towering) like mountains, and Noah called out to his son, who had separated himself (from the rest): O my son! embark with us, and be not with the unbelievers!. The son replied: I will betake myself to some mountain: it will save me from the water. Noah said: "This day nothing can save, from the command of Allah, any but those on whom He hath mercy! And the waves came between them, and the son was among those overwhelmed in the Flood."
First of all Mr. Jochen Katz, the Noble Quran doesn't admit anything in these Noble Verses above. Second of all, when Allah Almgihty took the life of Noah's son (because he was an unbeliever) in 11:43, and claimed that he saved Noah's family in 21:76, he wasn't contradicting himself. Noah's son was no longer Noah's son in Allah Almighty's eyes, because he did many bad things. Allah Almighty in in 21:76 was talking about the good members of Noah's family.
Jochen, you said "...difficult to comprehend for normal human beings...", well I would like to correct this quotation of yours for you. It should say "...difficult for me to comprehend and easy for normal human beings..."
Further more....
Jochen Katz further states: "Furthermore, there is a completely different, scientific problem. This whole conversation in 11:42-43 is impossible in the way it is reported. If you ever have been at sea when the waves are towering like mountains then you know how loud it is. Conversation, even when shouting is absolutely impossible. Note, it does not say that the water was already as deep as a mountain is high (but with a calm surface), it specifically speaks of waves, which means that there have to be strong winds to produce these waves. And that is always very loud."
I don't think there is any scientific problem in Noble Verses 11:42-43. Look carefully at "...And the waves came between them, and the son was among those overwhelmed in the Flood. (11:43)", it actually proves to us that the little conversation (which lasted probably for 3 seconds) took place before the strong waves came and took the unbelievers. It seems that during the conversation, there was water in the town, and Noah's son wanted to swim to the nearest mountain to save himself. However, the waves came too soon for him and took him away.
The conversation was too short (with only few words from Noah and his son). It only took few seconds in time length. There is obviously no contradiction in the Noble Verses presented.