Recently, my mate's hyper-religious, Seventh Day Adventist relatives came over for dinner. They don't swear, don't drink alcohol, don't wear jewelry (even the women), don't dance and only sing sacred songs. Thrilling people. Knowing that the one thing they'd likely have to do during their hours-long visit was use the guest bathroom, I decided to adorn the shelf over the toilet with a statuette I affectionately call "Slutty Salome". Happily, almost all the nine visitors used the facilities and, unless they peed or pooped with their eyes closed, had to have---at least briefly---endured Slutty's salacious gaze. I had good fun . . . But did I go too far or not far enough in my attempt to stick it to the relatives?
I wouldn't have gone out of my way to put something up to make others feel uncomfortable, but by the same token I would not remove anything I've adorned my shelves with on the chance they might find it objectionable. It's my home, decorated the way I like, and visitors have no say in my décor.
My son in law's came to my house, to meet me, before they were married, and now, if they come to visit, they stay at my house, so they don't have as many steps to climb as their house. They are Jewish, as is my son in law, and they know I am pagan. I have a lot of artwork, and a lot of eclectic stuff in my house. I don't put my stuff away, but I would never deliberately put out something to make them uncomfortable or embarrassed. If you did that deliberately, to make them embarrassed, it is too far. If that is something you always have out, that's different.
I lived with my 2nd husband (as a housemate) when I first moved to Wichita, KS. He hosted Mormon missionaries once a month in his home for dinner. He was none to happy when I refused to hide my gargoyle statues and HR Geiger like paintings before they came. At least I didn't have my stone skulls out in the open (they were in the bedroom).
I did compromise though; I didn't unbox my Living Dead Dolls until I got in my own place.
I used to have a goat skull, complete with large horns, with a solid black half burnt candle stuck to it. I burnt the candle so it had wax running onto the skull, I also cut myself while working on the car and dripped some blood on the skull as well.
I got quite a few quizzical looks from my room mates friends and parents, it was a hit at parties though.
My dog thought it tasted better than it looked.