I don't think the "idea" is wrong at all - I think the most important parts would be - what plan of salvation are they using - are they being baptized in Jesus name and being filled with the Holy Ghost believing that God is one? And why did they start the house church? Because they didn't want anyone over them? so they could do as they please? because they were bitter towards the local oneness church? If it is just because they were trying to be biblical and they believe in the
Acts 2:38 salvation plan believing that God is one then I see no problems with it.