To understand Spiritual Wisdom we must 1st understand God's view on the realm of the Spirit. If you talk to unbelievers they think it is foolish that Jesus is the only way. God is still showing us worldly wisdom is foolishness.
If anyone tells you that the Passover is not for Christians and that it is not done anymore, then you are talking to someone who does not know who the Lamb of God is or what it means. You are talking to someone who knows about some religious things but has never sat at the Feast of Redemption and experienced the Lamb of God, nor does he realize that he is outside looking in.