A false Christ is not a saving Christ that is the tragedy these people find themselves. Satan does not have to work too hard in the drug dens fallen man does well enough on his own carrying out such harm. Satan is most active in religion ploughing and planting so he can harvest a rich and abundant crop but even knowing this it is a joyous moment when you reveal scripture to the Jehovah Witnesses and you see In their eyes the veil being lifted, some light creeping in
By enlarge the Jehovah Witness are more devoted to the Watchtower society than truth much of it is cultural within the cult itself making it very hard to contemplate leaving but the deeper question, is there a genuine love of the scriptural truth present? if it is it will be manifested by the in dwelling of the Holy Spirit you may only see a glimpse of such in your brief conversations with them.