I saw this 2-part question posed in a Facebook group and saved my answer. I thought I would share it here for posterity sake.
1) How does a man fulfill his role as the spiritual head of the house and in so doing provide a spiritual covering and protection over his house and family?
In order to be leaders, I think we first have to take care of ourselves. 2 Corinthians 5:21 talks that we might become the righteousness of God. 1 Timothy 6:11: But as for you, O man of God, flee these things. Pursue righteousness, godliness, faith love, steadfastness, gentleness. Colossians 3:5 says to put to death what is earthly in us: sexual immorality, impurity, passion, evil desire and covetousness, which is idolatry. Put it to death! Just all of Colossians 3 is oozing with instruction for righteousness.
Colossians 3 and Ephesians 5 give us further instruction on how we are to treat our wives as Christ loved the church and gave himself up for her. Deuteronomy 6:7 says we shall teach the words of God diligently to our children and shall talk of them when you sit in your house, and when you walk, and when you lie down, and when you rise.
By pursuing righteousness we set an example that our family will naturally follow (as it is God’s design). By loving our wives and children and treating them as scripture describes we create an environment where they feel love and are flooded with the word of God. Practically I feel like this involves leading my family in prayer (always), leading them in the reading of scripture (family devotions), and leading them to church for corporate worship.
2) How are we to be in the world, but not of it, excelling in the pursuit of being a good steward over the talents we have been given and being fruitful and multiplying?
Matthew 6:33 is one of my all time favorite verses. “But seek first the kingdom of God and his righteousness, and all these things will be added to you.” By seeking the kingdom of God first, we will not be ‘of the world’. By giving glory to God in all that we do we can walk in the world and not be of it.