My stock response to such ignorant attacks is to provide links to three of my most popular blogs about Quran/Islam, which I did:
I have set out numerous extracts from the OT below. Christians and Jews may be offended and they may see this as an attack on their religion. It is nothing of the sort. I have made similar comments about what passes for "Hadith" in Islam. My view is that God has given us a mind and power of thought, which the Quran tells us we must apply to all things. Blind belief is an insult to human intelligence.