It's Simple

If God is a placebo
and the placebo effect works,
Then God works.

But only if you believe.

After all, both God and the placebo effect require unquestionable belief in order to be effective.

On the other hand, if you KNOW that that pill is a placebo, then it doesn't have an effect. The same also holds true for God. If you believe that God is a placebo, then there is no true belief in The Power Of God (the magical cure-all pill), and therefore God has no affect.

The most interesting part about this is that we have a choice to truly believe or not believe.

Ponder that one for a moment.