Church cooption of "natural law" is a disservice to nature, law and Jesus. They/we have rendered it divisive, anachronistic, static, homophobic, misogynistic, sectarian, and uh....unnatural.
Natural law is either the process of nature independent of what "humans" conclude about it/her.  Or..it is the accumulated body of reflection by human intelligence on the process of nature.  Or....it is the ethical-political conclusions about what is required for human beings to achieve order & security in common.
(Or something like the above)
Our church has elevated "natural law" to ITS religion, converted IT into doctrine, and imposes it as if it were dogma. Church has made itself into the legislature, executive and punitive agency - without delegation from the community, without accountability, and without a realistic, quasi-scientific, or demonstration base.  In this sense it is neither natural nor law. 
That's why it is, promotes, reinforces, preserves: divisiveness, homophobia..etc, as above.