The Gospel unifies, and at the same time, it enhances diversity without enforcing uniformity (see Romans 14; 1 Corinthians 8; Revelation 5:9; which reflect that there are different kinds of people, and because of these differences, Scripture explains how we should handle those differences in the Gospel). The fruit of the Gospel is a reflection of Who God is in Himself.
God in Himself is Father, Son, and Holy Spirit. Each is fully God (unity), yet they are distinctly different in role (diversity).