Just don't... that is a straw man. There are several known ways to detect air, its moment, how it interacts with objects (ever been in a wind tunnel)?<quoted text>
Err,....ah....no. You really can't 'see' air.
Blowing up a balloon would exhibit 'the effects' of air.
Similar to how you can see the effects of God's holy Spirit in a reformed sinner's new personality in The Lord.
There is no such way to detect any existence of your god.
You gave a bad comparison.