How do deniers of the personhood of the Holy Spirit interpret Romans 8:26-27?

Plain bible teaching does not entertain strange ideas of a holy spirit person.

There is no need for us to use creative imagination to arrive at the fanciful ideas as those construed by men writing 100’s of years after Christ and his apostles taught a simple truth about the one God the Father and His human son, Jesus.

No bible verse teaches the ‘person’ of Holy Spirit. But many are developed with erroneous logic and interpretation to make up such a thing.

The OP has noted several items supposedly indicating this person’s activities. This is a good example of reading into the text that which is simply not there. While it may form part of traditional dogma, that is irrelevant.

Let’s rather read the chapter in context and note how this spirit is mentioned.

• For in Christ Jesus the law of the Spirit of life
• controlled not by the flesh, but by the Spirit
• if anyone does not have the Spirit of Christ
• if you live according to the flesh, you will die; but if by the Spirit
• Spirit of sonship
• firstfruits of the Spirit
• the Spirit helps us in our weakness
• the mind of the Spirit

None of this requires us to think in ‘person’ terms. No Apostle did either or taught such a thing in the entire NT.

What is meant by ‘the mind of the spirit’? Simply that mind in each person, like Christ’s, which was in accord with God. It is not describing the mind of a spirit person, but of the kind of mind each human has that God is specifically involved with. The mind set on life, on peace, on truth- just as Jesus’ was.

Let this mind be in you which was also in Christ. Jesus Phil 2:5

Of course, our minds are still influenced by both good and evil, but when God’s spirit is involved, maturity and overcoming is the objective and fruit.

“He who searches the hearts” knows, recognises, this mind of God active in each believer or saint as v27 puts it -

according to the will of God.

Jesus had the mind of God working in him by the Holy Spirit in him. That he had his own independent and differing will, shows clearly that he also had to learn and choose the right way just as we all do - heeding that spirit of truth, wisdom and love that guides us toward the light.

What is the Holy Spirit? No more or less than the presence of God interacting within creation and His creatures. Joining with our carnal minds to change their course and purpose from a selfish, prideful pursuit, to a more Kingdom-centred focus.

The spirit of sonship, of truth, of Christ is all the same effect of having God close to us - not nearly quite as close as Jesus experienced, but the exact same influence anyway.

The spirit intercedes- When we respond to the guidance of God in us, His spirit adds to what we can accomplish. Granting another aspect to our person that we do not naturally have - the fruits of His spirit in us - Gal 5

There are many examples of the bible showing us what the Holy Spirit is and helpful in eliminating what it is not.

The disciples understood.

Most translators don’t as they insist on ‘he’ and ‘him’ everywhere, which is unwarranted and unnecessary from the Greek. This has caused much confusion and perpetuated the extra-biblical writings which have sought to supplant God’s word with an illogical and unholy construct.

We might continue to ask similar questions of every verse mentioning the Holy Spirit and diligently read in the same old extra bits that help uphold the traditional teaching. This is a fruitless endeavour as it requires ignoring the broad narrative of the NT and the complete silence of clear and definite passages that do reveal a Holy Spirit person.

When a dogma requires a ‘reading bits in’ approach, it should be discouraged.

More on the, ‘Not a Holy Spirit person’.