Dictionary.com defines the verb render as, “to cause to be or become; make”. NFP doesn’t make procreation impossible, but rather shows us when nature has made procreation either possible or impossible. Contraceptive use, on the other hand, which changes the natural end (or outcome) of sex, is an action that helps us render procreation impossible. Do you see the difference?
NFP renders procreation evident.
Lots of inaction can be selfish. Love sometimes requires action, sometimes inaction. Wisdom helps us discern which is best in any given situation. The Church is not against abstinence for married couples, the Church is against selfishness for married couples. Couples should normally be having babies. When they’ve got serious reason to not have a baby, it’s quite beautiful for them to abstain and offer that as a sacrifice to God. Abstinence is a choice though, not an intention. Intentions should be as selfless as possible.
Not everything new is sinful. Lots of new stuff is good or neutral, like cars or computers. Like those things though, NFP can be misused.
I think the virtue in abstinence has little to do with it being old. After all, contraception is old.
I appreciate that you may not want to discuss these things with me. I just wanted to toss some ideas out for you to consider. God Bless.