As someone who's both a Christian and a libertarian (at least in terms of most social issues as long as it's consenting adults), the best overall policy is for the gubment to stay out of each other's business, and for us Christians to win over hearts and minds by loving God, loving others, and living holy lives. In due time, people dealing with the natural consequences of hedonism will realize our way of life is best and want to take on our ways voluntarily.
Welfare spreads too much taxpayer money around to democommie coffers and for votes. Have to purge a lot of politicians from office first.