Why Are They Turning Away From Religion?

Because there faith is not strong enough.

Maybe they lost or never had Faith !

To be really honest everyone lives by a religion ie. A system of Do's and don't which guide our daily lives.  What a lot of persons have chosen to do is ignore or question whether a Creator should be the central focus around which they choose how they should live. That said I guess your question is why do people choose to Not Accept that they cannot shape thier lives by themselves and or need help and guidance from a Almighty God with or without a Hierarchy of Gods; a Universal Force or what some people call and Enlightened Being.  My reasons run like this:

1.  Sorry to be so blunt but they are stupid>>> The way the world runs from the fact that we need Oxygen to breath..that Friction can cause Fire...that Animals can only produce a like being...that Persons of different cultures "look Up" in thier various ways for answers.. That Life in all it's factors..love, wealth, governance,, excellence... Things we all my nature pursue  all exist by a hierarchy demonstrates design, order and a force of higher action for peace this Must be the design of a MAJOR GENIUS

2,  Because persons who say they are religious provide for others a very very very poor example and the weak among us do not focus on the wisdom innate in them but use these crazy sinners to excuse themselves from PEACE.