I notice you didn’t answer my questions. What do you find erroneous or irrational in the statements you quoted?
Naturally, if you don’t believe human beings have souls, or that the life of a human being is of any intrinsic value, you would not find arguments based on those premises convincing. However, most Christians would agree with the premises, I believe, even if they don’t follow the reasoning all the way to a categorical rejection of contraception.
I will say on your behalf that I consider your opinion to be more persuasive than the opinion of a church leader who doesn't participate in the activity at all, if that helps. Beyond that, I just think we disagree.