Hello and welcome to this forum!
Great points stressed in your post!
It's pretty easy for me to discern demonic spirits within people even on this forum!
A Tree is known by it's fruit that it bears.
The Lord told me to write this:
1 John 4:1- Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world. Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God: And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.
True Cleansing begins from within the heart of the individual and his/her acceptance to Christ as Lord God and His sacrifice and Mercy for them. Christians can fall back into old habits which were never truly defeated by the power of Christ in the first place!
God Bless!