The Devil is a human construct whose existence is valid only to those who believe in him. In other words, an actual Devil would be a personal hallucination. Real whilst at the same time not real.
Now I wouldn't want anyone to be fooled to think that it's a simple matter to dislodge long standing personal beliefs which are held to be true. Folks like oldschooler, Pinetree, Vigo, TedG, Grumpish and others make that point abundantly clear. And they kindly offer themselves up as fine examples to illustrate the truth of that statement. Importantly, it should be recognised, however, that we all have long standing personal beliefs which we hold to be true but are not.
As difficult, or as impossible, it is for us to change any of the beliefs of the posters I just mentioned so, too, every individual alive similarly harbors their share of false beliefs which seemingly no amount of explanation nor facts can persuade them to see their beliefs for what they are , , , beliefs about reality rather than actual, rockbed conditions of reality.
I think everyone, even the aforementioned posters, would agree that us humans are anything but all knowing. And the obvious conclusion that can be drawn from that fact is that since we are not all knowing then it is only inevitable that there are things we think we know but just aren't so. Which is why I oft repeat one of my favourite Samuel Clemens insightful quotes which is, in a way, shocking in it's implications:
“What gets us into trouble is not what we don't know. It's what we know for sure that just ain't so.”
Only a fool would believe that they've got everything right. Yet every generation tends to believe that their generation knows most all which is to be known and there is little left to discover.
I will remind that your question and similar, as whether or not evil or a Devil have any true reality and whether or not they are something of our own creation, are not easily explained and certainly cannot be explained, while imparting proper understanding, via a single sentence, or a single paragraph, or a lengthy post, or a thick tome.
I'll quote myself since the below should be thoroughly understood when asking such questions.
It's really me! Veteran of Thai Visa forum going back to when dr. pat pong & George were running the show. Veteran of Teak Door and Dirty Dog's minions etc. As the saying goes, it's been real but not especially fun.
As to the Pink Card, there is most definitely such a beast and it's handy for the farang to have. Jing, jing, mai go hok!
Easier than carrying around a bulky passport