You are planning things way too fast for your own good.
If you have religion issues, you need to speak with your family about them. It is tough being a teenager. You are at the stage where you don't have to be mommied or daddied, but you aren't at the stage yet to have full authority of things you are and aren't able to do.
If you have problems with your family, whatever they shall be, you need to talk with them about it. Right now, you are probably thinking that your family is just a burden you don't want to face, but one day, you are going to look back, and realize I made a horrible choice to leave my family. You might not see it now, but there is no place like home, and there is no place like family. Lots of people don't have families, so you need to be very thankful of that. So before you start making choices such as that, you need to really see the picture you are in, and see how good you do have it.