Surah 3:65-3:67

Someone was talking about Surah 3:65-3:67 and he says how the Quran be the word if god if allah that why do the Christian’s and Jews dispute about Abraham even though their scriptures came after his time. he says that Quran is also after Abraham’s time so how can he say that even though the Quran is after Abraham?, he says that argument is so dumb that the Quran cannot be from god