How delighted I am that you have decided to post to me again!
Assuming that this is more than a rhetorical question to me, let me answer simply that what a person or denomination believes about "contraception" has nothing whatsoever to do with the "Gospel". Though I don't approve of any contraceptive that causes an abortion (the death of the unborn) - as is the "secondary" effect of most oral birth control pills and other hormonal methods as well as the primary function of the IUD - the other choices a married couple have to regulate their own families is none of my business. It is between themselves and God. Just because the Roman Catholic Church has made the issue their business doesn't mean it has anything to do with the Gospel of the grace of God through faith in Jesus Christ.
It's very simply a question of how can non-Catholics who claim to be led only by Scripture and the Holy Spirit preach something as truth yesterday and the exact opposite today. At one time, either yesterday or today, they were not being led by Scripture and the Holy Spirit. It's that simple and that obvious no matter how the infallible interpreters of what Scripture they don't throw out try to obscure and avoid the question.
I ask again, were those folks who preached that contraception was a sin being led by the Holy Spirit and Scripture when they were preaching that doctrine or are they being led by the Holy Spirit and the Scripture now that they preach the exact opposite?