If Allah has a plan, what is the point of Dua?

[Brian37]

Allah already knows what will happen and it's all part of a grand scheme. So why make Dua (supplementary prayers)? Are we hoping to change the mind of Allah by praying? Have Allah cure us of the illness or cancer that was given to us, by it, as part of our personalized plan perhaps?

Allah gives a human cancer and then we beg extra hard for our Cancer to go away. That's so egotistical. Remind me, what was the point of cancer again?

Oh right, to test us in this Dunya. Why can't humanity have less painful tests? Like an exam maybe? An exam on Quran before entering Jannah perhaps?

Yes Allah is All Knowing, Wise. But we aren't. We don't know what is going to happen to us. Or how it's going to happen. But with Allah's mercy He gives us free will to live our lives as we wish. By Him being All Knowing He knows we can't do an atom's weight of anything against His will. So He tells us He accepts prayer and answers prayer, accepts sincere repentance (except dying in the state of unbelief and shirk). So will we have faith in Him as our Lord and creator and seek His knowledge, forgiveness and guidance? Also He being The Most Merciful, He expiates sins from His believing servants for any hardships(non intentionally)we go through. Sickness, sadness, pain, struggle, u name it. The Prophet Muhammad pbuh said " if a Muslim feels so much as the prick of a thorn Allah expiates some of his sins". The Prophet Muhammad pbuh also said"A Muslim loses their sins like a tree loses its leaves". So Allah tests us to see if we will seek His forgiveness, help, and guidance, or will we be arrogant, and try doing it ourselves without His help which absolutely will not happen. And to answer ur question about the cancer.  There are things that Allah does that go beyond our understanding. Because all of us as humans commit sins, and since cancer is a type of hardship Allah may possibly use it as a purgation or cleansing of sins from our souls in this life and out of His mercy, prevents us from the punishment of hellfire in the Hereafter. We have to always remember. We have plans and Allah has plans, and Allah is the best of planners.

Please try getting this through your head. EVERY religion argues the same thing. 

"Allah Is all Knowing"
"The God of Jesus is All Knowing"
"Yahweh of The Jews is ALL Knowing"

"But with Allah's mercy"
"But with Jesus's mercy"
"But with Yahweh's mercy"

"Allah has plans"
"Jesus has plans"
"Yahweh has plans"

And so what. Humans invent god claims. It was understandable back then when humans didn't know any better. Islam is a spin off of Christianity. Christianity is a spin off of Hebrew/Jewish. Hebrew/Jewish is a spin off of Canaanite polytheism. It is all made up, there never was a god.

Now again, what fails with the "Omni=All" argument, "All seeing, All knowing, All powerful, and All loving", does not work for any of the three religions. If these claimed three god claims have "a plan", you defy your trust in his plan by asking for help, if you trust this claimed being knows what he is doing, then you shouldn't have to ask for help or act as his salesman or public relations department. By selling your book and god, and by praying, you are admitting without realizing it, that you don't believe he can do the job without your help.

"free will" is a cop out argument. It does not work when Christians or Muslims or Jews do it. This isn't a fallible mere mortal according to any of these religions. This is someone according to them, that has the absolute power to prevent harm to all humans all the time if it wanted to. Are you going to be stupid and try to claim that an "all powerful" and "all loving god" would sit and watch year after year and watch 50 million humans die worldwide every year? That is the average number of deaths worldwide in every nation, dying from everything humans can die from, young, teen, young adult, middle age and old. They die in childbirth, childhood disease, and every age can and does die from disease, famine, natural disaster, accident, crime and war. 

50 million a year worldwide. That is half a billion deaths in a decade, and 1 billion every 20 years. You have the nerve to tell me 1 billion people all of them deserved it, or that this is all part of a perfect plan? I was born at night, just not last night.