Is it for us to say who is a real Muslim? Surely that cuts both ways.
Murdering children can be justified by the quran and hadith but if other Muslims read those edicts as belonging to an earlier time just as Christians interpret the old testament then more power to them.
I am not confident that Islam can reform but it's good to see glimmers of hope.
Notice that this cooperation was only possible as a result of successful military action. Sometimes you do have to fight for peace.