The movement should be one thing to all people. Freedom to people who worship and have traditional marriages, freedom for people who peacefully participate in orgies. Separation of church and state is good for both. People who want the government to enforce morality are not on the side of freedom and cannot be incorporated into the movement unless they put this desire aside and prioritize other more pressing issues like the economy. You can't pander to everybody, especially those who disagree with the core principles of the movement.
In terms of the argument, the government would not be giving an amen to any of the social contracts, the individuals involved would. What make's the pastor think the government is any form of religious authority anyhow? Their approval is not relevant to the believer. The liberty position is to have equal rights for people of all religions and beliefs (again, separation of church and state), and the best way to do this is not to pick sides on moral issues. Refusing to deny freedom to some does not imply agreement or support, but rather consistent protection of individuals' right to choose how to conduct themselves.
The law at many times has been inconsistent with the Christian faith in many places in the world. This does not prevent the Christians from leading by example and spreading their message of love, for they do not answer to secular authority but to a spiritual authority. The law is no excuse for the faithful. "Who prevented you from obeying the truth? This persuasion does not come from the one who calls you!" Galatians 5:7-8. << There were many Christian martyrs who refused to obey the law of their land
" For freedom Christ has set us free. Stand firm, then, and do not be subject again to the yoke of slavery. Listen! I, Paul, tell you that if you let yourselves be circumcised, Christ will be of no benefit to you at all! And I testify again to every man who lets himself be circumcised that he is obligated to obey the whole law. You who are trying to be declared righteous by the law have been alienated from Christ; you have fallen away from grace! For through the Spirit, by faith, we wait expectantly for the hope of righteousness. For in Christ Jesus neither circumcision nor uncircumcision carries any weight – the only thing that matters is faith working through love." -Galatians 5:1-6
" But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control. Against such things there is no law. Now those who belong to Christ have crucified the flesh with its passions and desires. If we live by the Spirit, let us also behave in accordance with the Spirit. Let us not become conceited, provoking one another, being jealous of one another. Support One Another Brothers and sisters if a person is discovered in some sin, you who are spiritual restore such a person in a spirit of gentleness. Pay close attention to yourselves, so that you are not tempted too. Carry one another’s burdens, and in this way you will fulfill the law of Christ." Galatians 5:22 -6:3