Contradiction with Genesis 15:6
Abraham believed God's promise to give him descendants, unlike Zechariah, who doubted.
Genesis 15:6: And he believed in the LORD; and he counted it to him for righteousness.
Contradiction with Hebrews 11:11
Through faith, Sarah received strength to conceive, contrasting Zechariah's initial doubt.
Hebrews 11:11: Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.
Contradiction with Mark 9:24
The father of the demon-possessed boy expressed belief but asked for help with his unbelief, unlike Zechariah's outright doubt.
Mark 9:24: And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.
Contradiction with Matthew 8:10
The centurion expressed strong faith in Jesus, in contrast to Zechariah's doubt.
Matthew 8:10: When Jesus heard [it], he marvelled, and said to them that followed, Verily I say unto you, I have not found so great faith, no, not in Israel.
Paradox #1
Zechariah asked for confirmation when an angel told him he would have a son, which reflected doubt. This doubt led to Zechariah being unable to speak until the child's birth. This can seem inconsistent with how God rewards faith, as Mary later asked a similar question about her own miraculous conception and was not punished. This might raise questions about why Zechariah was treated differently for his doubt.
Paradox #2
Luke 1:18 involves Zechariah questioning the angel Gabriel about the promise of a child due to his and his wife's old age. The potential moral inconsistency may lie in the fact that when Zechariah expresses doubt, he is punished with muteness, while Mary later questions the angel about her own miraculous pregnancy without punishment. This could raise questions about fairness or consistency in how doubt is treated in similar situations.