Why is believing in Jesus crucial for Christians?

For Christians, belief in Jesus is paramount as He is the mediator between God and man, as described in 1 Timothy 2:5. This belief encompasses trusting in His finished work on the cross for the forgiveness of sins. Rejecting this truth equates to rejecting God's provision for salvation. Moreover, it fosters a relationship with the Father, who desires for all to come to a saving knowledge of His Son. This belief is not only crucial for individual salvation but also for unity within the body of Christ, as believers are brought together under His name.