Here's a breakdown of what she means:
* "The Bible in the hand of one man": This refers to people who use religion as a shield for their own prejudices and harmful actions. They may quote scripture or claim to be acting in God's name, but their actions are far from Christian values.
* "Worse than a whiskey bottle": This is a strong comparison, highlighting how someone who is drunk might be more honest and less likely to inflict harm than someone using religion as a weapon.
* "Oh, your father?": Miss Maudie is referring to Atticus Finch, Scout's father. He is a man of strong moral character who believes in justice and equality, even when it's unpopular. This is a subtle nod to the contrast between Atticus's true Christian values and the hypocrisy of others who use religion to justify their own prejudices.
Ultimately, Miss Maudie is saying that true faith is about love and compassion, not judgment and cruelty. The Bible should be a guide for good deeds and a source of comfort, not a weapon to harm or oppress others.