If Al Taqiyya is acceptable to poster MyChoice, then how can we believe anything that he says? If being deceptive to Christians is acceptable, aren't we being foolish to even debate with him? 
Maybe plant a seed for them to see the error of their ways? They will bash this post, and Christians, and so on and so on.
It's hard for them to defend the Quran. (because it IS lies) I ask the OP, if it is indeed common knowledge in their 'community' that Mohammed/Quran have taken the number 666? (any studying/Google search will show you that they have and they do...claiming it is the God of the Bible who "tainted" those numbers?)
Not too much to proceed with in a debate with those who hate the God of the Bible. For it is only the God of the Bible that can show them the truth.