We can be sure that Jesus rose from the dead
There are many evidences for Christianity and there are many ways that the Bible authenticates itself as the Word of God. The most powerful proof of all is the resurrection of Jesus Christ. This event is woven within the history of the world, as is the whole narrative of the Bible. The resurrection of Jesus Christ is the most important event in all history. Consequently, evidence for it abounds.
The events recorded in the Bible did not occur in a remote corner or in a hidden place, unwitnessed, with no external evidence. Jesus Christ, or the True God, would not ask you to commit your life and salvation to Him with just a command, with no other proofs than just a claim to be the right way. Why? Because then anyone could come along and do the same. How could we then separate the Truth from a lie? Among many other proofs, the resurrection of Jesus Christ is the greatest evidence that the God of the Bible is the True God.
Please watch this video by Andy Bannister on the Resurrection of Jesus Christ.