If Atheists believe only on what is proved through experience.
History shows that the chance of
current understandings on things changing is 50 percent.   Today the
primary problem to solve is
which 50% of what we think we know is bound to be totally wrong in the
future.
This belief system is based on very unstable ground indeed!!

My belief is that most Christians are Atheists.  When all delusions
are boiled away what left is
a belief in Self preservation and Dominion over others through
trickery.  I think that a true "Christian"
keeps his thoughts to himself and leads a "Live and Let Live", "No
Harm No Foul",
"Sticks and Stones"  philosophy.

My $0.02