depends on how old u r. if ur under 18 & living in his house. follow his wishes that aren't harming u. Christians arent NOT allowed to color their hair
Why would you dye your hair? It says in the Bible not to because God made you perfect just the way you are. Why do you want to change the hair color when God gave you that specific color? Tattoos are not a solution btw.
I'm not sure whether Christianity has to do with ur dad not letting you dye your hair, because Christians are allowed to do that, it's just weird piercings like on ur tongue and stuff u can't do