Jesus Christ is 100% God and 100% Man, not just God or just Man.
The Old and Testaments are God's divinely inspired words and are dependent on the ministry of the Spirit of Truth (The person of the Holy Spirit) to reveal and confirm.
Salvation [restoration] has been purchased/established in Jesus Christ. The Blessing of David and Abraham realized, upon all people through His spirit within man's spirit. The empowerment or grace of His presence, active on the inside of man, to cause him to be all sufficient in all things and able to abound, lacking nothing.
While there may be many ways to "a god" - God the Father has given Jesus exclusive distribution rights to reveal WHO He is - to and through man.
Human beings conducting life as merely natural men are living from a limiting "core" nature, that they in themselves cannot get free from. All other associations mask their actual identity, and in turn, come up short in living in the fullness of the Father's family. Because mankind has been restored, freed from this limitation by being made righteous - they are free to take ownership of the upgrade, their restoration to a new core nature, and experience a life celebrated by their Father as He unfolds who they really are.
With the restoring of His presence within man - comes the restoration of all power and authority through man. The effectiveness of the latter is dependent on the influence of His presence within.
The Father designed our participation with Him in water baptism to be an affirming experience. We get to acknowledge being a New Creation with the inward reality that Jesus is Lord. The Father gets to look on with joy in declaring "This is My Beloved - in whom I am well pleased!"
Water baptism in itself will not change a person's core nature - but upon declaring Jesus as Lord, He designed it to impact a person's thought life to such a degree, that they are forever free from condemnation of any past or present failure.
The Father designed for man to walk together with Him and be in agreement. Confessing sins to God is aligning our perspective with His.
Furthermore it is God's design that every man not merely be forgiven, but going even further - being cleansed from all un-righteousness. [Released from the baggage of the "sin conscious residue in their thought life after the fact]. Creating an environment where His presence and power have full influence in their lives.
It is the will of God that every man live fully influenced through His Holy Spirit, resulting in a normal flow of the Father's heart / mind revealed through his voice - both in his native language, as well as the language from his "core nature", his spirit.
Human beings are a spirit; they have a mind (thought life and emotions). Just as the mind and emotions are expressed and communicated through a native language, the real you [your spirit connected and fully influenced] is not mute but also has a language in fellowship with God that is free from mental barriers.
The result is establishing a higher awareness in hearing and seeing - and therefore a greater effectiveness in serving people.
Physical wholeness has been paid for in the work of the Lord Jesus Christ and is for all people. He makes things new and nothing is impossible from Him and through Him.
All mankind was created to live fully influenced by the fullness that is the Father's family. To live in the upgraded nature/connected, is to flow in what the bible calls "The Gifts [graces] of The Spirit", bringing the influence of His presence into their lives and others, that produce restoration as a natural extension of their lives.