Who is "hearing" all those prayers, if God is a human invention?

Answer 1

No one/Nothing

Unless you can prove that than an "answered" prayer couldn't have happened (was completely impossible) without divine intervention you've got nothing.

Answer 2

Actually humans are a creation of God and God hears our prayers.

Prayer is the elevation of the mind and heart to God:
+ In praise of his glory
+ In petition for some desired good
+ In thanksgiving for a good received
+ In intercession for others before God

Through prayer the Christian experiences a communion with God through Christ in the Church.

"For me, prayer is a surge of the heart; it is a simple look turned toward heaven, it is a cry of recognition and of love, embracing both trial and joy." (St. Thérèse of Lisieux)

"Prayer is the raising of one's mind and heart to God or the requesting of good things from God." (St. John Damascene)

But when we pray, do we speak from the height of our pride and will, or "out of the depths" of a humble and contrite heart? (Psalm 130:1)

He who humbles himself will be exalted; humility is the foundation of prayer. Only when we humbly acknowledge that "we do not know how to pray as we ought," are we ready to receive freely the gift of prayer. "Man is a beggar before God."

With love in Christ.

Answer 3

There was a young man who went overseas to study for quite a longtime.
When he returned, he asked his parents to find him a religious scholar or any expert who could answer his 3 Questions.
Finally, his parents were able to find a Muslim scholar.
Young man: Who are you? Can you answer my questions?
Scholar: I am one of Allah’s slaves and (God willing), I will be able to answer your questions.
Young man: Are you sure? A lot of Professors and experts were notable to answer my questions.
Scholar: I will try my best, with the help of Allah
Young Man: I have 3 questions:
1. Does God exist? If so, show me His shape.
2. What is thaqdir (fate)?
3. If shaitan (Devil) was created from the fire, why at the end he will be thrown to hell that is also created from fire. It

certainly will not hurt him at all, since Shaitan (Devil) and the hell were created from fire. Did God not think of it this
far?
Suddenly, the Scholar slapped the young man's face very hard.

Young Man (feeling pain): Why do you get angry at me?

Scholar: I am not angry. The slap is my answer to your three questions.

Young Man: I really don't understand.

Scholar: How do you feel after I slapped you?

Young Man: Of course, I felt the pain.

Scholar: So do you believe that pain exists?

Young Man: Yes.
Scholar: Show me the shape of the pain!

Young Man: I cannot.

Scholar: That is my first answer. All of us feel God's existence without being able to see His shape...
Last night, did you dream that you will be slapped by me?

Young Man: No.

Scholar: Did you ever think that you will get a slap from me, today?

Young Man: No.

Scholar: That is takdir (fate) my second answer........ My hand that I used to slap you, what is it created from?

Young Man: It is created from flesh.

Scholar: How about your face, what is it created from?

Young Man: Flesh.

Scholar: How do you feel after I slapped you?

Young Man: In pain.

Scholar: Thats it. this is my third answer, Even though Shaitan(Devil) and also the hell were created from the fire, if Allah wants, insha-Allah (God willing), the hell will become a very painful place for Shaitan.

Allah said: "If you are ashamed of me, I will be ashamed of you."
If you are not ashamed, pass this message on...only if you believe. "Yes, I love Allah. Allah is my fountain of

Life and My Savior.

Allah keeps me going day & night. Without Allah, I am no one. But with Allah,I can do everything. Allah is my strength.”
"So which of thy Lords' bounties shall you deny"(Ar-Rahman