For some reason we, as Christians, have a horrible habit of building doctrine around one specific cultural issue. Then, we use that doctrine as the means for convincing unbelievers that they should come over to "our side." But, when you look at the bible, the Gospel that Jesus brought didn't start by addressing culture; it started with professing who He was. Then He commissioned us to tell others the same thing about who He is, what He came to do and why He did it. Any agenda that we approach unbelievers with, outside of the one Jesus brought, is useless to helping people enter into the heart of the Father.