The coexist graphic is an example of secularity and suggests a unity amongst all religious identities. A lot of religions have similar teachings and values and coexisting can get rid of some of the conflict associated with religious differences.
My "peace" tattoo spelled with symbols that you never find side-by-side. If we all live coexist together, as one, setting aside our differences; that is where we will find peace. Check out my other tattoos I have pinned on this board- Crystal Jewell.