I only watched a bit of the Discovery Channel's special on the Tomb of Jesus. It was enough. I saw some talking heads telling us that it had to be Jesus's tomb because the names matched his family. In particular, his brother's unusual nickname was found in the tomb along with lots of other names that matched his ancestry but were very common.
I'm not buying it. The proofs presented depended on a lot of precise details in the Bible being correct except for the ones that contradicted their thesis. They ignored details such as Jesus's family being too poor to own such a tomb or the implication that the family of Jesus of Nazareth might be from Nazareth instead of Jerusalem.
On the other hand, I don't think that this was an attack on Christianity. Last year's special on the Gospel of Judas was a genuine historical look at early Christianity and it made a lot of money. On TV, any time something makes money it will be imitated. That's all that this was. Just a bit of early history linked with Jesus in order to generate some controversy in order to bring in the viewers.