If Deidara would have been a girl. do you think he would be a Favorite among the Akatsuki guys?

Sure. It does not matter if he is a guy or a girl. He is liked by all akatsuki members... I think. And he would look great as a female. No doubt. I shall not be surprised if Sasori gets head over heels on him :)
Deidara is a beautiful person both at heart and from outside.

he isn't any way ..... so...........