Possible meanings are 1) "God acted powerfully and wisely by sending Christ to die for us" or "through Christ God has shown how strong and wise he is."
Another possible meaning is that Christ is powerful and it is through Christ that God saves us.
# the wisdom of God
Another possible meaning is that God shows the content of his wisdom through Christ.
# the foolishness of God is wiser than people, and the weakness of God is stronger than people
Possible meanings are 1) Paul is speaking ironically about God's foolishness and weakness. Paul knows God is not foolish or weak. AT: "what seems to be the foolishness of God is wiser than people's wisdom, and what seems to be the weakness of God is stronger than the people's strength" or 2) Paul is speaking from the point of view of the Greek people who may think God is foolish or weak. AT: "what people call God's foolishness is really wiser than what people call wisdom, and what people call God's weakness is really stronger than people's strength" (See: [[rc://en/ta/man/translate/figs-irony]])