I personally don't believe girls should be allowed to compete with guys in certain sports, especially those containing rough personal contact.
I'd have no problem with a girl competing against guys in baseball, basket ball, golf, tennis, swimming, track, soccer or even hockey. However, I do not agree that a girl should be allowed to play football (at least not after little league) and definitely not wrestling with guys.
I know football. I played football. For many players on the field football is nothing less than legalized assault.
As for wrestling, do you really want your young daughter or son in that close of contact with one another especially during and after puberty? As a christian male and a potential father, I would not want my child male or female to subjected to that.