I would sort of treat it like I do a dream and look at the circumstances surrounding when you see/think of stairs? I was in a group once, group therapy, and kept having a similar fantasy where I'd imagine myself doing a perfect somersault off the couch so I landed sitting on the floor? It wasn't possible but I would think about it endlessly and try to picture it.

At the time, I was frightened in therapy, sitting next to one of the therapists and had all sorts of things going on in therapy that was more than I could understand/put into words and work on? Perhaps, thinking about it now, the non-possible somersault corresponds to the not able to understand at that time? Maybe instead of a dream, I would think of it as a spacer or place holder now; I know when I did not understand something in my individual therapy I'd put a mental red flag there, like the flag on a golf course that showed where a hole is? That way I could find my way back to think about the "problem" until the time I could understand it and didn't need the red flag anymore.

From your post and nickname, I would think maybe you are stuggling with how faith/religion and psychotherapy/mental illness work together? I am reminded of Jesus being tempted by Satan to throw himself off the mountain, the angels would catch him? If you are having difficulty because your therapist or psychiatrist or others you want to work with don't seem to have your beliefs and you don't know how to proceed, I would have a discussion with them about it, see what you can learn, see if there are other alternatives that might be closer to what you believe or if you can learn of other perspectives that allow your beliefs and seeming needs to co-exist together in your head easier, etc.