Excellent reply.

Their argument is tantamount to saying “God can give us a message, but can’t preserve it.”

Doesn’t make sense.

Another thing that doesn’t make sense with their argument is that they would have no way of knowing something has been “corrupted” unless they knew what the “uncorrupted” version was.

Questioning corruption implies a standard of purity or correctness. If someone claims corruption, they implicitly acknowledge a presumed unaltered state. The assertion that the Bible has been corrupted is self defeating.