How can I have confidence that God will someday resurrect me to life forever in heaven?

John 11:25
Jesus said unto her, I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live:

1 Corinthians 15:12-14
Now if Christ be preached that he rose from the dead, how say some among you that there is no resurrection of the dead? [13] But if there be no resurrection of the dead, then is Christ not risen: [14] And if Christ be not risen, then is our preaching vain, and your faith is also vain.
Eyewitness evidence for any historical event is the most reliable. Hundreds of eyewitnesses claimed to have seen Jesus following the Resurrection. The apostles were willing to risk martyrdom for preaching the truth about it, and millions upon millions of changed lives bear witnesses to the fact that Jesus rose from the dead and is alive today. Because of the Resurrection, we know that Christ’s sacrifice on the cross accomplished God’s plan—our sins are forgiven and we will live forever with Jesus in heaven. Christianity, at its heart, is not just another moral or religious code, but resurrection and new life.