Question

Why do many believe Jesus will come back?


They don’t understand that he already fulfilled the expectations.


It is the only way to prove he was the Messiah.


They want him to.


There are expectations and predictions that he will fulfill.

Answer 1

Short answer: because Christians believe Scripture and church teaching promise it — and because the idea of a future return answers deep theological and human needs (final justice, the completion of God’s purposes, hope).

A little more detail:
- Biblical promises. Jesus and the New Testament repeatedly speak of a future coming (e.g. Acts 1:11; Matthew 24–25; 1 Thessalonians; Revelation). The historic creeds also affirm “He will come again.”
- Theological purpose. The return is seen as the consummation of the kingdom: resurrection of the dead, final judgment, vindication of Jesus, and restoration of creation.
- Church tradition and interpretation. The early church taught a future coming, and most Christian traditions still read the relevant texts as pointing to something still to occur.
- Human/psychological reasons. Hope for justice, relief from suffering, and longing for wrongs to be made right make the idea attractive and meaningful.

About the four statements you listed:
- “They don’t understand that he already fulfilled the expectations.” — Some Christians (preterists or those who emphasize a “spiritual” fulfillment) hold that many prophecies were already fulfilled, but most Christians interpret key passages as referring to a future, visible return.
- “It is the only way to prove he was the Messiah.” — Some argue the resurrection already proves his messiahship; others see the messianic role as two-stage (suffering first, then triumphant return), so a future coming is part of that proof.
- “They want him to.” — Desire and hope are real motivators, but belief is normally grounded in scriptural and theological claims rather than wishful thinking alone.
- “There are expectations and predictions that he will fulfill.” — Yes. This is the central reason: texts and tradition predict a return, so many expect it to happen.

If you want, I can summarize the main Christian views about how and when the return will happen (premillennial, amillennial, postmillennial, preterist) or give key scriptural passages people cite.