If a person is devieved, and claims to believe teachings that are not of God's word (ie if it's some footnote they read in the ASV), they are not of God
His will is not done through them, and they do not pray 5 or even 1 times a day, so you do not see them being lead in any way by the Spirit.
Now, if they claim to be of God and, are not, we call them "lukewarm". They may even be Jewish decievers paid by FEMA, but "fake Christian" is more accurate (like referring to (((them))) as "fake Jews" instead).
Any confused person will understand if they are presented with Biblical reality, provided they are in any way rooted in reality.
Any fool living a lie, will not accept anything except that which makes him "feel good". They will have their share in the lake of fire.