basically, the quran are trying to convice that christianity/bible is wrong,..
thats why Quran dont recite about the prophet Isaiah, which speaks about the Son of God that will be born in bethlehem.
Their main argument :
1. Jesus have never been resurrected/die.
2. Biblical word/understanding (ie : Trinity)
3. Biblical History ( Ismael/Ishak)
4. Their knowledge embedded Quran, proving Quran is far more superior through (questionable?) interpretation.
When infact Quran it self was writen 500 years after jesus was born, and they claimed the otherwise, and it was writen by 1 person. ( Which completely different from the bible which was written directly from the source, people who lived exactly at the moment jesus was born and died, written by various person which have different social and knowledge background, yet they are telling the same main idea, salvation !). (Well, FYI, i lived in the country where muslims are the largest (85%)).