Then it seems to me they are saying more than they really know. For they don't know how you will "turn out," what you will become, etc.; and they don't know how Christ will judge you. For all they know, He may have a very special place in His heart for you....
In any case we are directed to love our neighbor as ourself. To flat-out tell someone that they are damned to Hell doesn't strike me as being particularly neighborly.... FWIW
We are all predestined, right?
Indeed, the Great Commandment is to love God absolutely. And the second is to love our neighbor unconditionally. Everything - the law, the prophets - "hang" on those two commandments. (Matthew 22)