Prayers don't work so why do religious keep jabbing at it?

[GrandizerII]

When you pray for something to happen and it does, how do you know it wouldn't have happened had you not prayed for it?

Boru

The subject of the prayer lets me know. Some matters look impossible to happen but after praying for them to happen specifically; they come to be. Like a needle in a pile of grass.

For example, praying to be great at a work you do -that you aren't at all skilled at-, but suddenly after praying you find that the subject of the prayer came to be.

You could've prayed to a rock, and the effect would've been the same. There was a saying in Arabic I used to hear a lot from my late grandmother that says:

Aamen bil 7ajar, toushfa

Believe in rocks, you will be cured.