Do you believe that the Devil exists?

No.

yes he does. Even writes, tries to run nations, religions.

Jesus Christ is Lord.

Yes I do but if you are interested in becoming one of his followers you should be aware that on discovering he exists it also proves that God exists which is why the vast majority of satanists etc are paranoid about what will happen to them not surprisingly. I have known ex satanists/devil worshipers and it is one of the hardest things to break free from in the world. The devils only purpose is to steal souls away from the kingdom of light and although he gives candy to his followers it is candy laced with poison which leads them to their utter ruination. The devil preaches glory power and salvation but practices deceit treachery and murder.

Yes, the devil and his demons are evil spirits. The Bible says we must oppose the devil, avoid spiritism and the occult. Deuteronomy 18:10-12.

Devil is an evil spirit. Both good and bad spirits exist on this earth. Spirits were created by God for all creatures including human beings. A mind was installed in each creature. Except human minds all other minds were controlled by spirits. Animals are 100% under the control of the spirits but humans are not. Humans can live by choosing the spirits. But after choosing the spirits, the chosen spirits will rule them. The rule of democracy.

even in the fantasy world of judeo-christian religion the "devil" is illogical, since you can't have an omnipotent being defied by a supernatural criminal, similarly original sin being transferred to every human ever is illogical as is the necessity of god to provide his "son" to die to assuage the guilt which totally defies logic

Yes.

I knew the truth of the forces of evil, which are led by satan(the devil), long before I came to know The Truth of What The Creator God offers.................the forces of evil are VERY real.......... and only those of The Body of The True Church have the authority that can hold the forces of evil at bay

definitely

I know he does cuz GOD NEVER LIES EVER...

devil stalks the world seeking whom he may devour.