So...
Why discuss birth control on a conservative news forum???
The biggest challenge to conservatism is championing the Culture of Life in a society and political climate in large part obsessed with the Culture of Death. If we lose the fight for the Culture of Life, the Republic is lost. Any other political debate is moot.
To understand the roots of the acceptance of many facets of the Culture of Death, one must grasp recent historical developments in Christianity.
As pointed out directly above, in 1930 mainstream "Bible only" protestantism fell away from the constant teaching of Christianity regarding contraception. Christianity always taught contraception was intrinsically evil. (This was ALL Christians, for ALL time, not just Catholics. The point isn't even debatable.)
This change in teaching on contraception is the very root cause of the eventual legalization of abortion.
Abortion follows the acceptance of contraceptive mentality as night follows day. In Planned Parenthood v. Casey, the US Supreme Court decision that confirmed Roe v. Wade [U.S. decision to permit abortions] stated "in some critical respects, abortion is of the same character as the decision to use contraception... for two decades of economic and social developments, people have organized intimate relationships and made choices that define their views of themselves and their places in society, in reliance on the availability of abortion in the event that contraception should fail." As Professor Janet Smith points out, "The Supreme Court decision has made completely unnecessary, any efforts to "expose" what is really behind the attachment of the modern age to abortion. As the Supreme Court candidly states, we need abortion so that we can continue our contraceptive lifestyles."
Furthermore, because mainstream protestantism and "Bible Christianity" in general condones non-procreative contraceptive sex, they have no moral authority upon which to preach against non-procreative homosexual sex, as homosexual "Christian" theologians are pointing out even today.
Thus the homosexual agenda juggernaut is also directly a result of the failure of "Bible Christianity" on the birth control issue, as well as the reluctance of the Catholic hierarchy and priesthood to promote Humanae Vitae and the Church's true teachings on sexuality in general. And if you can kill the innocent baby in the womb, why not granny in the nursing home? Euthanasia too is becoming widespread, as a result of the acceptance of abortion, which came from this change in moral teachings regarding, and acceptance of, the contraceptive mentality among Christian churches.
The widespread acceptance in American culture of the culture of death --abortion, contraception, homosexuality, euthanasia-- lies squarely on the backs of those who caved in on these life issues several decades ago.
Until Christianity turns back from this apostacy, respect for human life from conception til natural death, the hallmark of any true political conservatism, will continue to erode.
I think that about sums it up nicely.
Thanks for the obvious "elbow grease" you put in on this.