How do humans attain knowledge and understand what is true? We do not do so as individuals, but together as communities.
Why do humans create beatiful works of art and tell stories? One reason is in order to communicate knowledge and truth to others.
What, then, is ultimately true and real? The Christian story of God's love for his creation affirms that we live in a world that is good, in spite of the presence of evil. But God has defeated evil through love.
Based on this, how ought we to behave? We should act in love for the benefit of all those with whom we share this world.