There is an easy way to test whether there is a god or not. What is the effectiveness of prayer?
Prayer has been proven to be ineffective. I know that christians will dispute the findings, but if you look at the findings objectively you will see that prayer has no effect.
They will then make up lame excuses about unrelated things. But will in no way show that prayer does a thing.
Facts don't lie or have an agenda. Facts are just facts