The pop singer and “American Idol” finalist says writing “Devout” let him finally talk about things he never felt allowed to share. David Archuleta understands some of his fans may be caught off-guard by his candid new autobiography , “Devout: Losing My Faith to Find Myself.” Still, the pop singer and “ American Idol ” veteran is hopeful those who go along for the ride will feel encouraged to “take back the trust that you put into things outside of you, and put that trust into yourself.” “I got