I have discussed this with my Muslim friends, so far they think Bitcoin can only be traded in trading like forex, because according to the teachings of their investments such as deposits and stock trades it is forbidden, why forbidden because the money that worked,

I explain little that Bitcoin not only available with trading but can be with mining too, he asked "what is mining", mining it is to mine Bitcoin and its job of transaction validation or break the block with Bitcoin as a pay,

then he replied, "ohhh ... all this time I think Bitcoin can only be in trading only". end  
so all this time they just do not understand Bitcoin deeper so think it's forbidden.