Christianity is a monotheistic religion centered around the life, teachings, death, and resurrection of Jesus Christ, whom Christians believe to be the Son of God and the Messiah. It is one of the world's largest religions, with various denominations and beliefs, but key tenets include love, forgiveness, salvation, and the belief in the Holy Trinity (Father, Son, and Holy Spirit).

Christianity holds significant importance both historically and culturally. It has shaped societies, influenced laws, art, literature, and ethics for over two millennia. Moreover, for billions of people worldwide, it provides a framework for understanding life's purpose, moral guidance, and spiritual fulfillment.

The core beliefs of Christians typically include:

1. **Belief in God**: Christians believe in one God who is the creator of the universe.

2. **Belief in Jesus Christ**: They believe that Jesus Christ is the Son of God, who became incarnate, lived a sinless life, died on the cross for humanity's sins, and was resurrected on the third day.

3. **Salvation through Jesus**: Christians believe that through faith in Jesus Christ, one can attain salvation and eternal life.

4. **The Holy Trinity**: Christians believe in the Trinity, which consists of God the Father, Jesus Christ the Son, and the Holy Spirit.

5. **The Bible**: Christians view the Bible as the inspired word of God, containing teachings, history, and guidance for living a faithful life.

6. **The Church**: Christians believe in the importance of gathering together in worship, fellowship, and service as part of the body of Christ, the Church.

7. **The Second Coming**: Many Christians believe in the Second Coming of Jesus Christ, where he will return to judge the living and the dead and establish his kingdom.

These beliefs can vary among different denominations and interpretations within Christianity.

Predicting the end of any religion is challenging as it depends on various factors such as societal changes, cultural shifts, and individual beliefs. While religions can evolve and change over time, Christianity has shown remarkable resilience and adaptability throughout history. It's difficult to foresee its complete disappearance, but like all religions, its influence and prominence may wax and wane in different regions and eras.