A few quick thoughts which probably have already been expressed.
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1. Both artificial birth control and the church-approved method have a common goal: prevent pregnancy. If one is condemned as somehow thwarting God's will, why not the other?
Did you even read the thread? It has been expressed that regulating births is not the problem nor does the church forbid this, but rather we may not regulate births using immoral means. Artificial birth control is not immoral because it is “artificial” or man made, or because it helps couples regulate births, but rather because it goes against God’s purpose and plan for marriage and marital love.
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2. Science has given us many man-made creations. I believe some Bishop 100+ years ago said that God had intended for us to fly he would have provided us with wings! We even have artificial hearts now. Artificial is not always a negative word.
See above, this is not why artificial birth control is immoral.
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3. Married sex is not to be viewed only for the procreation of children. It also is an important expression of love, often the balm that heals after a marital spat, perhaps, certainly a romantic, pleasurable act that helps bond husbands and wives.
The Church teaches that these purposes (procreation and unitive) of marriage cannot be separated. To separate them goes against God’s purpose.
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4. It could be argued that the bedroom is the private preserve of married couples and if they choose to use artificial birth control, why should any church forbid it?
Wow, do people actually make this argument? So God has no place in the relationship with ones spouse? We should be striving to do God’s will in all aspects of our lives not just in the areas that we choose.
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5. As a practical matter, the church has alienated millions by its condemnation on artificial birth control. Feeling guilty, they say, in effect, 'to heck with the church'. Someday (I predict) that rule will be changed.
So because a lot of people don’t like it that makes it right or the truth? This is also a bad argument. The majority of people thought that slavery in the US was ok, did this make is right? Of course not, there is objective truth revealed by God. But if there is no one to say what this is, we have what we had during slavery with people interpreting the Bible to say that slavery was ok, which is why we need the Church.
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6. Even today priests differ. I know someone who confessed use of birth control to one priest and received a severe scolding. Away for awhile, at another church the priest told him in effect to do what his conscience seemed to command. It was a matter between him and God.
So what? Individual priests are not the Magisterium. Not to mention that priests are humans with all the failings and sins that come with that. I heard an unfortunate phrase once, that priests who abrogate the rules for their parishioners are probably abrogating the rules for themselves.
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7. I know one family who had six children. The wife became afraid, even hostile, toward sexual union because she feared another pregnancy. Her doctor had warned her that another pregnancy could likely mean her death and probably that of the child. The couple finally agreed to use artificial birth control. How big a sin was that? When a priest lectured her at the confessional they decided to attend the Episcopal Church.
Did they even try NFP? Not to mention, what happens if ABC fails? Many of the most common ABCs are abortifacients, so how many of their children are they killing? Have you seen the show “I didn’t know I was pregnant,” it is full of people who were on ABCs and got pregnant.
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8. Some Catholics resent that a celibate male clergy appears to make such rules. If they were married they would have a better understanding of the complex issues involved. Besides, where does Christ forbid artificial birth control? One rather wild reference usually is quoted from somewhere in Genesis.
Many people equate ABCs, especially condoms with the sin of Onan. I am not sure if this is correct, but the bible cannot be our only source of truth, because otherwise we couldn’t be against cloning or other ethical problems in today’s world.
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9. It's one thing to forbid abortion. But to forbid artificial birth control also is likely to lead to abortions. Artificial birth control cuts down on abortions. Otherwise, abortion becomes a far more extreme form of birth control.
Are you sure about this? I mean really, many ABCs are abortifacients and are already killing babies, and what happens when ABC fails? If we follow the church and use NFP to plan children and it fails we can know it is God’s will or (our failure)
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10. While we discourage and even condemn pre-marital sex, certainly among youth, if it happens artificial birth control diminishes the likelihood of single parents, devastated lives, distressed and often angry grandparents, unwanted child, etc.
Yeah cause its worked so well already. We don’t want you to have sex, but if you do here’s a condom. Or better yet, place the burden on the girls and make them take dangerous hormones: you shouldn’t have sex but here is the Pill just in case.

Ten sounds like a good number on which to stop.
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God bless all of his children, of everfy creed, color and country.