JILIB, Somalia — Islamic militants in Somalia recently killed a woman who led an underground Christian movement in the war-torn country. Sources said a leader of Islamic extremist al-Shabaab militia in Lower Juba identified only as Sheikh Arbow shot to death 46-year-old Mariam Muhina Hussein at 2 p.m. Sept. 28 in Marerey village after discovering she had six Bibles. Marerey…