[Solumina]

I'm not really sure what "the goth way" is or what religion has to do with anything. I'm going to go ahead and assume that you mean that your mother is very conservative. If that is the case then you may want to ease your way into this new look so it isn't a shock.

Your mentioned practicing with the mascara but have you spent any time practicing your hair? If you just go at it with a comb and tease the hell out of it you could very well end up with your hair looking like a mess.

Do what you want but keep in mind that you still live under your parent's roof so respect the fact that they don't want you going out looking like a fool.