Contradiction with Proverbs 28:9
If you turn away your ear from hearing the law, even your prayer shall be an abomination, contradicts the notion of God hearing prayers.
Proverbs 28:9: He that turneth away his ear from hearing the law, even his prayer [shall be] abomination.
Contradiction with Isaiah 1:15
God states that when you spread forth your hands in prayer, He will hide His eyes and not listen, contradicting the idea that God hears all prayers.
Isaiah 1:15: And when ye spread forth your hands, I will hide mine eyes from you: yea, when ye make many prayers, I will not hear: your hands are full of blood. [make...: Heb. multiply prayer] [blood: Heb. bloods]
Contradiction with John 9:31
God does not listen to sinners but to the godly person who does His will, which contradicts the idea of God hearing all prayers equally.
John 9:31: Now we know that God heareth not sinners: but if any man be a worshipper of God, and doeth his will, him he heareth.