washington president barack obama take republican presidential candidates stir anxiety among americans tell leaders washington national prayer breakfast thursday faith could conquer fear bring war technology economic trouble primal emotion fear one experience contagious spread societies nations obama say know many faith great cure fear jesus good cure fear god give believers power love sound mind require conquer fear important moment faith right say obama remark come day first visit u.s. mosque seek allay fear americans accustom pop-culture portrayals muslims terrorists reassure muslim american youth identity republican presidential front-runner donald trump call temporary ban muslims enter unite state obama christian say faith help deal challenge president bolster children grow prepare adulthood help deal common everyday fear share main one feel right children grow fast leave say laughter president say draw faith comfort parent children kill gun violence subtle reference fail effort sharpen u.s. gun control laws say people faith help take syrian refugees subtle jab republicans oppose allow country obama say faith cure fear stir war hard time