Either the story of Jesus rising from the dead is true, or His disciples knew that they were going to their deaths for a lie.
There are many other possibilities, the moment you step away from the Bible being an inerrant document. The truth of the record in the Bible is a matter of faith.
Religious people of all faiths going to their deaths has been common down the ages. Given the different myths that they all believed clearly most of them were deluded, as you right now believe muslim suicide bombers to be deluded.