If a "blind leap in the dark" means believing in Jesus without having any evidence to support your faith, then your faith may not last. I don't doubt your friends' sincerity, but God has given us solid reasons to believe in Jesus, and I hope you'll discover them for yourself.
Tomorrow, millions of Christians will celebrate the most startling event in human history -- the resurrection of Jesus Christ from the dead. You probably know the background: His enemies had decided to destroy Him, and He was condemned to die in the cruelest way possible, by being nailed to a cross. Hours later, there could be no doubt He was dead; the Roman soldiers confirmed it, and His body was taken down and placed in a cave-like tomb, its entrance sealed by a large stone.
But on the third day, some women came to the tomb and discovered the stone had been rolled away and the tomb was empty! By the power of God, Jesus had been raised from the dead, and during the next 40 days He appeared repeatedly to His followers, including over 500 at one time (see 1 Corinthians 15:1-8).
Why do I focus on Jesus' resurrection? Because it wasn't a myth or legend; it really happened! And once you understand this, your doubts will fade. And you will find yourself saying with Thomas, who once had been filled with doubt, "My Lord and my God!" (John 20:28).