Final answer:
Jesus Christ's role in planning the church is best described as the Messiah.
Step-by-step explanation:
The role of Jesus Christ in planning the church is best described as the Messiah. The term 'Messiah' refers to the belief that Jesus is the chosen one, the savior, and the founder of Christianity. Jesus played a central role in the establishment and teachings of the church, laying the foundation for the beliefs and practices followed by his disciples and subsequent generations of Christians.