FirstLoveMovies

https://www.imdb.com/title/tt1290135/

Any idea who are the couple of actors who get freaky in the church and their ages?

I am sorry but I have no answer to your question. Maybe someone else knows this version of the story.

I am pretty sure this would have actual children in it, so I moved it to REQuests, because this is not a RELease until someone provides an ed2k link for it.

These UNVERIFIED links look like reasonable 720p or 1080p possibilities for anyone wishing to download or stream:
https://mkvking.icu/children-of-the-corn-2009/
https://bflix.gg/movie/watch-children-of-the-corn-8395
https://ulozto.net/file/cilQuTP7Tk4i/st ... MyAGtjZN==
https://ulozto.net/file/yivxL6sXuxsm/st ... 5AqKSdLJEz

It's also at https://ok.ru/video/48179841608 - sure I could watch the scene and try to ascertain which of the unnamed characters are the two lucky ones but if someone knows or can identify them by all means

Dunno if this information is true or not:

Later that night, Isaac holds a sermon in the church based on the tenet of "be fruitful and multiply" and proclaims that the time of fertilization has come. He beckons a teenage girl (Zita Vass) and boy (Jake White) up to the front of the church and they immediately disrobe and have sex in front of the entire congregation, much to their excitement.

https://alchetron.com/Children-of-the-Corn-(2009-film)

I found it on the Internet, so it must be true, right?

Zita Vass credited as "Ponytail Girl", age 20 at release date.
Jake White credited as "Oldest Boy", age unknown.

THAT scene starts about 75 minutes in (I watched it at mkvking, Stephen King, get it?) and from their IMDB pictures I would say it probably is them.

EDIT: other sites give Zita's birth year as 1992 instead of 1989. So, who knows, maybe she was 17?