There are some individuals who scoff at the doctrine of the Trinity. Most don’t do this and rightly accept it as orthodox Christian truth, but though I think most Church-goers rightly accept the Trinity they have no idea why/how this doctrine matters at all. Here is one reason (of many). Salvation is a Trinitarian action. Ephesians 1:3-14 shows this.
1:3-6 shows the activity of the Father, “Blessed be the God and Father of our Lord Jesus Christ, who has blessed us in Christ with every spiritual blessing in the heavenly places, even as He chose us in Him before the foundation of the world, that we should be holy and blameless before Him. In love He predestined us for adoption as sons through Jesus Christ, according to the purpose of His will, to the praise of His glorious grace, with which He has blessed us in the Beloved.”
See it? It was the Father, not the Son or the Spirit, who planned, predestined, and elected us for salvation through Jesus before the foundation of the world.
1:7-12 shows the activity of the Son, “In Him we have redemption through His blood, the forgiveness of our trespasses, according to the riches of His grace, which He lavished upon us, in all wisdom and insight making known to us the mystery of His will, according to His purpose, which He set forth in Christ as a plan for the fullness of time, to unite all things in Him, things in heaven and things on earth. In Him we have obtained an inheritance, having been predestined according to the purpose of Him who works all things according to the counsel of His will, so that we who were the first to hope in Christ might be to the praise of His glory.”
See it? It was the Son, not the Father or the Spirit, who redeemed us through His blood. It is Christ’s lavish grace we rest and boast in because by His blood we now have the hope of the glory of God.
1:13-14 show the activity of the Spirit, “In Him you also, when you heard the word of truth, the gospel of your salvation, and believed in Him, were sealed with the promised Holy Spirit, who is the guarantee of our inheritance until we acquire possession of it, to the praise of His glory.”
See it? It was the Spirit, not the Father or the Son, that was sealed within us, who is our down payment, or inheritance of the future possession to come.
So you see, everything that happened to every Christian at salvation had everything to do with each member of the Trinity. The Father plans, the Son redeems by His blood, and the Spirit applies redemption to us sealing us for the age to come.
This is why on my churches website, you’ll find the following statement:
We believe in one God, eternally existing in three equally divine Persons: the Father, the Son, and the Holy Spirit, who know, love, and glorify one another. This one true and living God is infinitely perfect both in his love and in his holiness. He is the Creator of all things, visible and invisible, and is therefore worthy to receive all glory and adoration. Immortal and eternal, he perfectly and exhaustively knows the end from the beginning, sustains and sovereignly rules over all things, and providentially brings about his eternal good purposes to redeem a people for himself and restore his fallen creation, to the praise of his glorious grace.