Prove it straight from the pages of your own Bible!
I know that what I am about to write is not "politically correct." But let me put it this way: Why should you expect the God of the Bible to answer the prayers of people who pray to some other god? Who pray in a wrong manner? Who regularly disobey the true God? Who ask for the wrong things?
The answer is simple—you should not! Make no mistake. You have no reason to expect real answers to your prayers unless you pray to the true God in the right way. This may seem outrageous to those who take Christianity for granted—just another of the many religions in the world. But the truth is that literally millions of people in our Western, supposedly Christian, world have no idea who the true God is, or how they should pray to Him.
Oh, I am quite aware that many people repeat some kind of "mumbo jumbo" or "mantra" to themselves, and end up "feeling better." And since problems oftentimes work themselves out, many people feel that they received an answer to their prayers when they really did not. This often goes hand in hand with the practices of "mind science" or the "power of positive thinking."