No, I wouldn't. I'm raising my child in the Assemby of God church, and my pastor and congregation is opposed to girls wearing pants, jewelry and having boyish haircuts. She wanted to get her hair cut the other day, and I let her, but only a little was trimmed off and she was fine with that.
OK, yes, that was almost a complete fabrication. My daughter does prefer to wear dresses and skirts, but she will wear pants too at times. She did really want to get her hair cut, and came back with it practically the same length. I think my DH had a part in that, however.
I almost never wear skirts myself, simply because I don't have any that look good. In fact, I was just thinking this last night--I really need some dressier clothes!
I believe that a girl wearing pants is rarely stigmatized in the same way a boy wearing a dress would be. I think a more interesting question would be whether you let your girls wear skirts for the reasons that Kristin mentioned. There are times when I actively discourage my daughter from wearing a dress, usually because they aren't as warm and won't protect her legs as well. We do have some playdresses with leggings, but if we know she is going to be riding a horse or a camel or something that day, I figure the pants are just easier, so I mention that to her.