"Table" here is a metonym that represents feasting, and "net" and "trap" are metaphors that represent punishment. You can translate this in an active form. Alternate translation: "Please, God, make their feasts like a trap that catches them" (See: [[rc://en/ta/man/jit/figs-metonymy]] and [[rc://en/ta/man/jit/figs-metaphor]] and [[rc://en/ta/man/jit/figs-activepassive]])
A "stumbling block" is anything that causes a person to trip so that he falls down. Here it represents something that tempts a person to sin. Alternate translation: "something that tempts them to sin" (See: [[rc://en/ta/man/jit/figs-metaphor]])