@joey jojo
You noted that if the Trinity were "cut and dry," it wouldn’t require extensive explanation. However, the complexity of the Trinity arises because it attempts to articulate the nature of God—a being beyond full human comprehension. The Church Fathers recognized this difficulty and admitted that the Trinity is a mystery, but one based on revealed truths in Scripture. The extensive explanations, charts, and discussions are not because the doctrine is baseless, but because God’s infinite nature requires careful articulation to avoid misunderstanding. Concepts like God's eternity, omnipresence, and omniscience also require effort to explain, but that does not negate their validity.
You express concerns about the reliance on John’s Gospel and the role of commentators. The Gospel of John is particularly theological, emphasizing Jesus' divine nature (e.g., John 1:1, John 8:58, John 10:30). While John’s Gospel has a unique style, it is consistent with the rest of Scripture (cf. Philippians 2:6, Colossians 2:9, Hebrews 1:3). Bible commentators are not “inventing” the Trinity; they are explaining how Scripture, taken as a whole, supports the doctrine. The Trinity is a synthesis of biblical teaching, not a single verse.
The statement “the Father is greater than I” (John 14:28) often raises questions, but it is not contradictory to the Trinity when understood in context. During His earthly ministry, Jesus voluntarily took on a subordinate role (Philippians 2:6-8). His statement reflects His role in the incarnation, not an eternal inequality with the Father. The Trinity teaches that the Father, Son, and Holy Spirit are equal in nature (ontological equality) but distinct in roles (functional subordination). Jesus can say the Father is "greater" in terms of role without denying His own divinity.
The statement “no one knows...but the Father” (Matthew 24:36) is another common objection to the Trinity. Here’s how it can be understood. In His incarnation, Jesus voluntarily limited His knowledge in certain areas. This does not negate His divine nature but shows the humility of His human nature. In the mystery of the Incarnation, attributes of Jesus' divine and human natures are not always fully expressed. While Jesus’ divine nature knows all (John 21:17), His human nature could legitimately say, “I don’t know.”
So these statements reflect different contexts: John 1:1 establishes the eternal, divine nature of the Word (Jesus) as God, John 14:28 reflects Jesus’ incarnational role and submission during His earthly ministry. Both truths coexist without contradiction when we understand the hypostatic union: Jesus is fully God and fully man.
The doctrine of the Trinity is complex, not because it is untrue, but because it grapples with the infinite nature of God. Statements like "the Father is greater than I" and "no one knows but the Father" reflect Jesus' incarnate role, not a denial of His deity. The early Christians, through careful exegesis of Scripture, articulated the Trinity to preserve the biblical truths about God, the Son, and the Holy Spirit.