Contradiction with Proverbs 22:6
Mark 9:21 involves questioning a father about his child's suffering, whereas Proverbs 22:6 emphasizes training a child in the right way without mention of suffering or doubts.
Proverbs 22:6: Train up a child in the way he should go: and when he is old, he will not depart from it. [Train...: or, Catechise] [in...: Heb. in his way]
Contradiction with Matthew 7:7
Mark 9:21 involves seeking understanding through questioning, while Matthew 7:7 encourages that one will receive if they ask without querying duration or background.
Matthew 7:7: Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you:
Contradiction with James 1:5
Mark 9:21 questions for understanding the length of suffering, whereas James 1:5 suggests asking God directly for wisdom without hesitation or prior knowledge.
James 1:5: If any of you lack wisdom, let him ask of God, that giveth to all [men] liberally, and upbraideth not; and it shall be given him.