The opposing argument is that we don’t know that there weren’t attempts to expose the lies; we only know that we don’t have them today.2 If that argument holds, then our defense of the miracles of Jesus is really just an argument from silence.
Does Christianity stand on that kind of shaky ground? I don’t think so.
First, I think we can safely say that any of Jesus’ miracles – even all of them – is disposable with one exception: the resurrection. That is the one miracle for which we do have an opposing story – see Matt 28:11-15. Why didn’t that story take? Because it's harder to believe than a mere miracle.
Second, even if we had no other evidence, an argument from silence for the resurrection is still strong because in the face of any reasonable alternative story the resurrection wouldn’t fly. Quite simply, if the resurrection didn’t happen, the body was still in the tomb. If the body was available, it would have been produced when Christianity got annoying – apparently within the first year or two. A religion built around a risen savior couldn’t fly in the presence of a body.
As I’ve written before, Christianity is based on a story no one would make up. If we don’t assume from the start that miracles are impossible, the evidence for the resurrection is pretty sturdy. And that’s good news because, as Paul said, “if Christ has not been raised… you are still in your sins” and “we are to be pitied more than all men.” But since He has been raised, then we too shall be raised, and we will be like Him, forever, to the glory of God.
(1) I like a good argument, and there are so few new ones from the skeptics, but it's always sad to come across unbelievers.
(2) The original is at an