"If the 'Rhythm Method' is acceptable, why not condoms, which are likewise contraceptive, and NOT abortive? "

Because condoms make intercourse possible during periods in which the rhythm method mandates intercourse not take place. This means a couple might "enjoy" each other during a wider span of time.

"Enjoy" is the operative word here. From St. Paul through several of the early church fathers, enjoyment of sex was thought to be giving in to your animalistic instincts, and harming you spiritually.

So while the "rhythm method" grugingly allows the gate of hell to be open during a short period of time, condoms allow it to be open almost all the time.

Gosh - we just cannot have that. Give people the ability to make their own choices? Encourage animal behavior? Herasy! Next thing you know people might use reason to think for themselves instead of relying on "us" to tell them how to live and what to believe.