Afganistan: Must Converts to Christianity hide from family and friends?

Suppose a person becomes a Muslim in America or England, leaving behind their Anglican or Roman Catholic heritage? Would they have to hide from family and friends for fear that they would be killed?

Or, suppose that a Muslim in Afghanistan became a Christian. Would they have to hide from family and friends for feat of death? 

Here is one person's story, in Afghanistan, resulting from that kind of fear.