Maybe ask them to explain Gen 1:27: "So God created mankind in his own image, in the image of God he created them; male and female he created them."

He's just as much female as he is male, and vice versa. "He/Father" appeals to a patriarchal society, but Jesus had a good proportion of female followers, and it was some of them that discovered the empty tomb. God is neither male nor female, or both, depending how you look at it.