Hopefully this thread won't be considered too off-the-wall, but I was wondering... for Christians with the Gift of Discernment, who can actually see spirits, do they see a lot of bad spirits hanging around devout Atheists and Agnostics?
Spirits are not physical to be seen, per-se (for spectators' benefit, I know you and I are already on the same page). I would rather say that we recognise spirits.
Think of the meaning behind the expression: "the spirit of the season". It means in the case of Christmas, to be of good cheer, jolly, generous etc.
In Christian terms, to speak of angels/demons and Christ, these are real people who we may encounter besides the human through whom they may present. In cases where spirits are possessing a human as a vessel, it is the spirit that speaks and animates the body, while communication is the mechanism for spirits to impact people. So, whether holy or unholy spirit coming and going in that one, it is the same alphabet and vocabulary being used. The host (human) often doesn't perceive at all, when the spirit is speaking through them (though sometimes we do). Often, an intense conversation with a spirit-possessed person, they will not remember. Usually they do though.
Spiritual warriors live dangerously. Evil spirits are strategic toward our destruction. They may provoke us to act questionably, and then imprint our behaviour into the memory of their vessel such that negative misrepresentation occurs. It seems likely to be part of why Jesus never permitted them to speak.
An interesting statement was made today as a couple of missionaries visited me. He said "We all have the two natures within us. We all have The Holy Spirit". This was especially interesting to me, because it really rang true with something I wrote elsewhere last night. This scripture is particularly central:
"God is love. He who stays in love stays in God, and God in him". 1 John 4:16.
So, when someone is acting to us in love, he is a reliable host for The Holy Spirit. Conversely, when someone is acting to us in sin (eg, pride, jealousy, anger etc), they are more of a vessel for the unholy spirits than The Holy Spirit. Our actions are useful to trigger this in others. If we offend that one by transgressing them, we have given legal right (according to our transgression of God's law) for them to resent us. This gives the foothold for the devil (Ephesians 4:26-27). Conversely, when we turn the other cheek, it gives legal right for The Holy Spirit to act in conviction upon them, and if we do so with ready forgiveness, they can be motivated to repent and thus become healed - becoming a vessel again suitable for The Holy Spirit.
Hurt and resentment is thus the key. Then, in this way, we are able to deliberately drive out demons simply by acting in love. They are crafty and do not respect the law of God (as the holy ones do), so do not be surprised that evil spirits appear before we have triggered that one's resentment. They are desperate to destroy us, because God is with us as we are opposing their place in the world.
.. So, as for your question of Agnostic and Atheist people goes, I say not necessarily. Underneath all of this, is fundamental law of love. Atheists and Agnostics are capable of loving (therefore forgiving, not resenting), and thus being useful vessels for The Holy Spirit (John 3:8, Romans 7:9). When you look at the criteria for salvation described by Jesus in Matthew 25, it is not our beliefs that determines our blessing or curse, but it is our love. Jesus drafts us sheep and goat upon the way we treat others (therefore, do we respect the spirit of Christ that is in them - Matthew 25:40-45). Also consider John 10:16, because a belief is only as good as the fruit it produces, and ultimately paradise requires love.
.. It's a lot to take in. It might be a bit daunting too, but don't be afraid! Remember that Jesus loves you more than you can imagine, He is on your side, and He has been raised above all the heavens to be at God's right hand. If God is for us, who can be against us?
Regarding your MD's, indeed, use wisdom. Doctors are naturally inclined toward compassion! - If you perceive some conflict, then pray about it, but remember Romans 13:1-5. God wants to set us free from such crippling conditions and have us in full vitality of health, to be a real glorious example of His salvation! Most mental conditions can be healed by counselling (ie, constructive understanding - John 14:16-17, Isaiah 9:6), or it's symptoms can often be managed (eg by medication).