Follow this logic:
God is by definition supernatural.
To be supernatural you must be outside of the natural world.
Supernatural and Natural are mutually exclusive.
Anything that can be scientifically proven is part of the natural world.
Therefore anything supernatural can not be scientifically proven.
Therefore God can not be scientifically proven.
Therefore any scientific proof that God is supernatural must by definition fail.
Since God by definition must be supernatural to exist, then the existence of God can not be proved by science.
If God were proved by science then it would be part of the natural world and therefore not God.
BTW – this is a trap to get believers to think about reality. We in the Church of Reality believe that the more you use logic the more you will reprogram your brain to think about reality. Thinking undermines faith. If you think about this it might cause you to question what you believe. You are hereby warned not to risk your immortal soul by thinking about this. God prefers people who don’t think over people who do because people who don’t think have an easier time of believing without questioning than people who do think.