There are some strands of evidence for the resurrection of Christ which seem very compelling. They are: the empty tomb, the post-crucifixion appearances of Christ, the transformation of the apostles, the conversion of Saul, the emergence of the early Christian church, and the switch from the last day of the week to the first day of the week for worship.
However, there are some natural explanations which have been hypothesized as alternative possibilities for the resurrection of Jesus Christ. One of these natural explanations is the "Swoon Theory". The "Swoon Theory" suggests that Jesus Christ didn't die on the cross! He survived the crucifixion, which is how he was seen three days later by the disciples!
However, I think the following "Spamalot" video clip can help illustrate how this isn't very plausible. In the clip, it shows a cart being pulled around town collecting those who have died from the Bubonic Plague. Clearly, the guy pulling the cart can tell if someone is dead or not, and if they're not yet dead, they don't go on the cart. The same applies with criminals on the cross! The executioners can tell if they are dead or not! And if they're not dead yet, they don't get off the cross, and they certainly don't get buried into tombs.
Now for Jesus of Nazareth, I don't expect, even if he wasn't quite not dead yet, he wouldn't have been able to dance around like the fellow in Spamalot. He wouldn't have taken the flogging and the beating and the crucifixion and three days being buried without food and water to somehow roll away a giant rock by himself and parade around in such a state that people will go - "Dang, he rose from the dead and he can raise me from the dead too!" Even if he could do all those things, he'd need to see a doctor. He wouldn't be fooling anyone! What do you think?