[Brian Kopp DPM]

Orthodoxy has no intent on changing the clear teachings on Scripture

Good.

As per St. Augustine:

"For it is illicit and shameful for a man to lie with even his lawful wife in such a way as to prevent the conception of offspring. This is what Onan, son of Judah, used to do; and for that God slew him" (cf. Gen. 38: 8-10).

Obviously, the Church Fathers saw the prohibition against contraception as SRIPTURAL. So why have the Orthodox changed a teaching of moral theology that was not merely a disciplinary canon but that was based on Scripture according to the Church Fathers?

[FormerLib]

Orthodoxy has no intent on changing the clear teachings on Scripture

Good.

As per St. Augustine:

You can stop right there, Doc. Saint Augustine is not to be confused with Scripture.

Keeping that in mind will make your discussions with Orthodox go much smoother.