ouch, religion is always difficult. especially the satan and devil worship thing. personally unless you are lighting many candles in your basement and sacrificing small goats and singing weird tunes to satan, you arent worshipping him. wear whatever u like, you obviously cant please your family without changing your whole character, so dont try. just try to not get too wound up by it all.
take care
self
P.S how does your bro react to thinking he is posessed by the devil???