How does one worship something in the Spirit?
It is something One does 'within'. In other words, it is not an outward ritual or some kind of 'work'.
To worship 'in Spirit' is to be guided by the Holy Ghost, which is the same as the Holy Sprit...
Romans 8:16
"The Spirit itself beareth witness with our spirit, that we are the children of God"
Spirit Itself = Holy Spirit of God
Our Spirit = The Holy Spirit we are born with
They must be tuned to one another. Quantum Entangled.
which agrees with Paul's statement in Corinthians 3:16 that the Spirit in self is God's?
1 Corinthians 3:16
"Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you?"
Here is another one...
1 Corinthians 6:19
"What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own?"
All Life is born with the Holy Ghost/Spirit. This is something that most Christians do not understand.
The Spirit we all have is Energy/Electromagnetism/Electricity, etc. It is what 'quickens' us and makes us alive.
When a Lifeform dies, it 'gives up the ghost'. When One 'receives the Holy Ghost' it is a 'renewal'...
Titus 3:5
"Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost"
which agrees with ecclesiastes 12:7?
Ecclesiastes 12:7
"Then shall the dust return to the earth as it was: and the spirit shall return unto God who gave it."
There we see the proof that a Lifeform's Spirit goes back to God. Everything that is alive has a Spirit.
Spirit is never destroyed. Energy is never destroyed.
John 14:7
"If ye had known me, ye should have known my Father also: and from henceforth ye know him, and have seen him."
The above is a bit different. It is more about the Word of God in relation to the rest of the Trinity.
Think of the Word of God as being the Seed growing in a plant.
The Father would be the Plant, the Seed would be the Word. They are separate, yet they are One. Both are kept alive by the Holy Spirit.
Thus, we have the Godhead or Trinity...
1 John 5:7
"For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one."
An even better way of understanding the Trinity is to think of the Father as Abraham, Jesus as the Word or 'Seed' in the loins of Abraham.
Jesus is the Seed (singular) of Abraham...
Galatians 3:16
"Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ."
In the Throne Room we have a picture of Abraham sitting on the Throne. The 'Slain Lamb' represents the Seed in the loins. The Rainbow Round About is the Holy Spirit...
Revelation 4:3
"And he that sat was to look upon like a jasper and a sardine stone: and there was a rainbow round about the throne, in sight like unto an emerald."
Combine all three and we have the Trinity. Now, here is where things get a little mind blowing.
The entire scene is being manifested, like a 3D image on a computer screen, from the single Invisible God called a Consuming Fire...
Hebrews 12:29
"For our God is a consuming fire."
Outside of Time and Space is an infinite field of energy and information that is sentient. This is the Christian God in his highest form.
This 'Consuming Fire' is where the Trinity becomes One and the same. Said Consuming Fire then 'frames' the 3D material world we live in...
Hebrews 11:3
"Through faith we understand that the worlds were framed by the word of God, so that things which are seen were not made of things which do appear."
Word of God = Software Code and Infinite Energy (Non-Physical/Wave)
Things which are seen = Our 3D Reality (Physical/Particle)
Not made of things which do appear = The 'Invisible God' of Consuming Fire.
It is similar to the movie 'The Matrix' where everyone is living in a type of Simulation. They must have gotten the idea from the Bible.