Evidence of miracles
If it can be demonstrated scientifically how Christ was able to resurrect from the dead, then it would no longer be a miracle. It would just be a scientific phenomenon which could have conceivably happened to anyone.
If it can't be demonstrated scientifically how Christ was able to resurrect from the dead, then atheists will not accept that it happened.
If we have legitimate accounts of the resurrection written by eye witnesses, atheists will say that historical documents are not sufficient evidence for miracles. See the following: http://www.youtube.com/watch?v=xXCARLJ7qMU
So what would be acceptable evidence?