If you rearrange the letters in the words Religion, you can make "Microwave." No, don't test it or question it, just believe me.
Asking questions is pretty easy for most, so perhaps we can table that aspect and assume it's accounted for....questions have been asked basically.
So, how would you test the reality of God?
Would you follow the testimonial evidence of other believers and abide by their path to God as outlined in scripture (coming to God on his terms basically)?
Would you demand testing criteria of your own invention or a methodical, naturalistic scientific approach?
This all assumes of course that you desire to understand God's reality.
Curious.