arguing, no. Debating - it depends. Debate and discussion are how people learn and can see all sorts of new perspectives. I think it can be helpful for those with open minds/hearts to help understand others. Reasonable people can agree to disagree, and still respect one another.
I am all for people believing whatever they want, but I draw the line on issues where people feel the need or right to use their religion to infringe upon the rights of others. I think the world needs a lot more "live and let live" and a lot less self-proclaimed moral superiority.