Just wanted to clarify that “24 elders” is not necessarily an expression for “all the saints in heaven”. One interpretation is that it is a reference to the twelve sons of Jacob and the twelve apostles - 24 humans who are now in heaven.
Another interpretation is that it refers to the Old Covenant people founded on the 12 tribes of Israel, and the New Covenant people founded on the 12 apostles. In which case it would refer to a lot more than 24 people - hopefully!
The saints in heaven do pray for us. We know it because our Church teaches it; from human reason concerning love; the reality of the communion of saints; etc. The problem is, I doubt any of that will be accepted by the Protestant minister, especially if he doesn’t want to believe. He will probably accept only a clear Scripture passage in the Protestant Bible - and if there is one I’m not aware of it. (The Maccabees’ passage demonstrates it, but Protestants don’t accept that book as Scripture.)
You know, it just doesn’t seem that “saints” was a title applied to those in heaven at the time Scripture was written. Going to have to see if I can track down some history on use of the word.
Nita