No one goes to their death for what they know is a lie.
Jesus said many times that he would be put to death, and
would rise again on the third day.
At the time of his death Jesus' followers were mostly no where
to be found. Peter denied him 3 times.
Then, once Jesus appeared to them, you find them zealously
leading the astounding growth of the Christian church in the first
century. Some skeptics like Jesus' brother James are leaders
in the movement. What made the difference?
1 Corinthians 15:
3 For what I received I passed on to you as of first importance[a]: that Christ died for our sins according to the Scriptures, 4 that he was buried, that he was raised on the third day according to the Scriptures, 5 and that he appeared to Cephas,[b] and then to the Twelve. 6 After that, he appeared to more than five hundred of the brothers and sisters at the same time, most of whom are still living, though some have fallen asleep. 7
Then he appeared to James, then to all the apostles
For more details read the book written by an atheist called
"Who Moved the Stone" Frank Morison set out to disprove the
historical Jesus, and ended up being converted by the evidence.
http://www.amazon.com/Who-Moved-Ston.../dp/0310295610