To speak or not to speak

I had an appt with someone related to foster care today. Matt was at basketball practice. This man began to tell me how he got into an argument with his brother-in-law over Thanksgiving. The gist of it is - the BIL is a Christian pastor, and the man I had an appt with today is Islamic. The brother in law made several statements to this man - all of which were true statements, BUT were said in a negative sort of way, a pushy, confrontational way.

I am really torn tonight - I wanted SOOOOO badly to say something; I wanted to witness to him; BUT he was telling me "I am not going to change my mind, and I am not going to change my BIL mind"; so.... I bit my tongue and didn't say anything. I did say to him that it wasn't right the WAY that his BIL treated him; and that it seemed to me that was what really upset him. I feel in my heart that I failed. I should have said more to him - ANYTHING would have been better than nothing. BUT he was still very much on the offense; and did NOT seem receptive at all. SO, I did not agree with anything he said that contradicted the Bible, instead I just stared at him blankly. I treated him with respect, and listened with a sincere heart. But I have to say - even though I know it would have caused him to go off on me; probably cause me problems with my foster care license, and cause me a major amount of stress - that would be better than letting a man walk out of my house knowing he does not know the One True God and His Son who saves us from our sins. :(

Matt always says - there is no need in arguing with someone who isn't willing to listen; that doesn't accomplish anything. That definitely fits this case. But I still don't feel right about not speaking up for the Truth, and reaching out to him.