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II Tim 3
16All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness;

17so that the man of God may be adequate, equipped for every good work.

Scripture = So man of God may be adequate, If I'm adequate in God's eyes that's all I need.

Proplem is some Church's add/take away from what makes one adequate in God's eyes and make them adequate in man's eyes.

The reason you state we need Church is in the Bible.
Those things Jesus did, Paul did that are not written must not be needed because the scripture are adequate.

We need preaching/teaching/Instruction: but all that must be done without conflicting with the Word “The Bible”, So all the supplements must be done according to the Word of God, no other Gospel is accepted by God. We know we need this because the Bible tells us, not because the Bible is missing stuff

God has given us “all things that pertain to life and
godliness” - 2Pe 1:3

IN THE SCRIPTURES, WE HAVE ALL WE NEED...
To believe in Jesus - Jn 20:30-31
To have life in His name - Jn 20:30-31
To have fellowship with the Father, the Son, and the apostles- 1Jn 1:3
To have joy that is full - 1Jn 1:4
To have help when we sin - 1Jn 2:1
To know that we have eternal life - 1Jn 5:13
To understand the revelation of the mystery of God - Ro 16:
25-26; Ep 3:3-4
To be fruitful in the knowledge of Jesus Christ and have an
abundant entrance into the everlasting kingdom - 2Pe 1:8-11

What else must one know or have?