Is Muhammad the Messenger of Allah?

When Muslims ask you about any one issue of Islam, try to find a way of tying that back into one central discussion is the Quran. What's he referring to? The murder that he committed, right? Fid'al tak, fid'alTak, let he fight. All those other questions are actually avenues, they're windows, but you want to get them to the door, right? Now, whether they accept Islam or not, that's up to Allah Subh'anaHu Wa Ta'ana.