It should be no object of amazement that they think one can only say Jesus is Lord if they are Spirit filled. They don't realize the true meaning being stated there. A devil worshipper could walk up unbeknownst to them and if he can say 'Jesus is Lord' they'd buy him as a long lost Christian Lamb. They view it all 2 dimensionally - I have Gas therefore I can fuel and drive a car. Well, Duh. That isn't the point. The point is that without the existance of Gas, you couldn't build the car - much less do anything else with it. It's no wonder their priests get their butts kicked in spiritual warfare..
It is quite a spiritual thing to change the way a possible Christian views the bible. To change his perception fo the bible from the Living and Active Word of God to one of 3 possible inputs in a very convoluted religious puzzle is a major victory for the Adversary.
Now here's the rub that should be a dead giveaway after all this time. The deep spiritual issues are resolved in a christian through the spirit. They are pursued and gotten wrong in wannabes because they apply logic and reason and try to figure it out on their own. Thus, Catholicism doesn't understand the nature of sin or of much anything else. It's tripped up by multiple baptisms because it doesn't understand the difference. etc.
It is interesting how little time it actually takes to disciple a new Christian in the right direction when their hearts have been prepared to learn. A Lutheran friend of mine pointed out that through the Holy Spirit a Christian isn't magically endowed with knowledge, but he does have a supernatural discernment that will keep him from lies. It's an interesting thought. I've always wondered what would have been the outcome in my discipleship if I had hooked up with a JW or LDS or RC when I first got saved.