James 5:16 KJV
Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.
Like so much of the Bible, when taken literally, it just doesn't stack up at all. The Bible tells us that God is in total control, that he has everything planned down to the most finite detail and that nothing, absolutely nothing can sway that purpose and plan.
I could cite all the Bible verses that confirm this but I can see you are quite capable of doing this yourself.
There is very simple logic that follows from those foundational principles.
For example, if it is God's plan that your mother is going to get terminal cancer and die from it then that IS his plan. According to the Bible nothing you can say or do is going to change that plan. Hence praying for your mother to be healed and not die of cancer is in fact direct opposition to what God wants. Actually it's pretty much blasphemy.
This is critical thinking logic that most Christians just seem to miss and fail to understand in their blinkered indoctrination.
In one breath they say that God controls everything and nothing happens without his will (which therefore must include wars, sexual abuses, pandemics and so on) and in the next breath they're all telling us that we should pray that these things don't happen.
They haven't the basic reasoning to see how hypocritical and juxtapositioned that thinking is.
If God did not want the mother to have terminal cancer then he would have willed it not to be. If she has cancer then God HAS willed it. He has either made it happen himself or deliberately allowed the universe to do it. If not he would not be an Omnipotent God.
If he has willed it then nothing anyone else says or does can change that will. Trying to undo that will is to act against God's plan, to obstruct his plan which wouldn't go down well in Christianity.
Thus on the concept of praying there can really only every be ONE THING that Christians should pray for. That is to understand God's will and to understand what he wants you to do.
You can't pray to stop something because it's God's will that it is happening.
No point praying to find a living survivor buried under the rubble in Turkey's earthquake because God clearly allowed the earthquake and it was part of his plan that it happened. That needs to sink in for all Christians. God is in control, God is Omnipotent and so he IS responsible for all these things happening. He has permitted it to happen whether he directly caused it to happen or not. It amounts to the same thing.
The Lord's Prayer iterates this simple logic.
Our Father, who art in heaven, hallowed by thine name
Thy kingdom come,
thy will be done
On Earth as it is in Heaven
Anyone who prays this prayer and then later prays for things that have happened to not happen or to cease happening is simply a hypocrite that is deluding themselves. You have to accept Gods will or not. It's a binary choice. Yes or no.
That is. . . . if you are going to allow yourself to believe all of this doctrine which frankly just doesn't stand up to scrutiny or hold water.
The idea that God would be so sick and twisted and inherently evil as to make a mother sick with terminal cancer just to see if other humans would beg for her to be healed is the stuff of utter delusional fantasy. That would not be the behaviour of an all-powerful all-loving deity. That would be the sick and degrading behaviour of an absolutely despotic tyrant.
So Christians really should be asking themselves what are they really allowing themselves to believe in? Do they truly accept that God is in control and that all the sick atrocities we see, all the innocent kids getting sexually abused, all the awful deaths from pandemics, wars, diseases, all the women being caught and sold into sexual slavery, all the murders etc are all just part of God's wonderful plan? Really?
Does that really sound like the plan of an all-loving entity to you? Why have you believed that? Who convinced you to think that way?
Have the strength and courage to confront the universe that you are a part of. Accept it for what it is. Understand your place in it. Realise that humans love to dupe and exploit other more vulnerable humans for their own benefit. Question the religious indoctrination you have been given. Exercise critical thinking and reasoning.