"And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and..." - Hebrews 11:6 (NIV).  It is good for us to start by building this foundation of faith: God exists.  For some, this is simply a valuable reminder.  For others, this will strengthen our understanding to more fully believe.  We need to be firm in this foundational truth, equipped to reason with others about it.