Is It Possible Jesus Has Already Come?

Questions about whether it’s possible Jesus has already come in a fashion similar to Elijah coming as John the Baptist, whether Jesus was an apocalyptic prophet who was wrong about the kingdom coming in his disciples’ lifetime, and what part Jesus’ resurrection plays in salvation.

• Is it possible Jesus has already come in a fashion similar to Elijah coming as John the Baptist?
• What are the arguments opposing the current view of New Testament scholars that Jesus was an apocalyptic prophet who was ultimately wrong about the kingdom coming within his disciples’ lifetime?
• What part does Jesus’ resurrection play in salvation?