I think it's important for self-proclaimed Protestants, by conviction, to adhere to the practice of Sola Scriptura and allow the New Testament to define for us what "the church" actually is, which is the body of believers. It's the elect of Christ that He's been gathering since the beginning of time.
There are too many Protestants today, by tradition, who seem to think that "the church" is a building with a steeple on top. While a church meeting can take place within a physical structure, I believe what we mostly see today is not the model that is found in Acts and the Epistles. Christians in the first century went from house to house and gathered in the wilderness.
The model that I see today has too much focus on maintaining the building itself rather than maintaining the spiritual kingdom. This inevitably leads to pastors misusing OT scriptures related to financial giving in order to guilt trip folks into feeling the need to contribute to the building's enormous cost overrun, which profits the utility companies who have been unnecessarily hiking up their rates for years, as well as paying down the building's debt, which goes into the banker's pockets rather than going directly to those in need of food, clothing and shelter.
So, if we were to define "the church" by what we mostly see today in corporate America, then I would say it absolutely is irrelevant and always has been.
I think your model sounds absolutely ghastly, though if it works for you, by all means carry on. One thing that we know the church in Corinth did was to meet regularly
'as a church.' While they didn't do that particularly well, Paul does not suggest that they go back to wandering about from house to house. I expect that the church had become too big for that. Paul speaks of the
'churches [plural]
of Galatia' (1:2), which probably means those churches in the various towns in the region of Galatia, but whatever it means, they weren't doing much better than the church at Corinth [singular - 1 Cor. 1:2; 2 Cor. 1:1], were they?
The Lord Jesus and His apostles kept a money bag. Does that mean they were a business? The N.T. is very clear that it is the command of Christ
'that those who preach the gospel should live from the gospel' (1 Cor. 9:14. Read from v.7). Where did the money come from to give the preachers that living? From the free-will offerings of the people, just as it is today. How did Paul pay for the rent of the
'school of Tyrannus'? In just the same way, no doubt. Are there some pastors today who
'suppose that godliness is a means of gain'? No doubt, but so it was in the 1st Century.
At the little church that I attend, we never demand that anyone should give anything - we don't even take up a collection, but the saints in Exmouth UK give according to their means and the congregation of around 70 are able to support one full-time and two part-time workers, and keep the church buildings in good repair.