I would say a Christian married to a Muslim, purely because their is too much bad feeling towards each other's religion, to have any tolerance.
As Nighthawk pointed out, even though one parent could be Christian, the parent who is Muslim, would in Muslim countries be deemed the parent who should get parental responsibility of the children should the marriage fail-- regardless of who is the better parent.
It is rather worrying in my opinion, that you would lose your rights to your children, through marrying someone of a different faith!