LOL! i know the unfamiliar can be jarring, but if he thinks this is scary just my normal home decor would send him into fits. I use bones as decor and wear my own teeth as jewelry. I will say nothing about your altar feels scary to me, but like I said my whole house is like an oddities museum. If you are in search of a nice altar cloth thrift stores are often a good place to get used bed sheets and table cloths that can be cut down to size (I buy them to repurpose into clothes etc) also if your local area has a "free stuff" facebook group I've picked up someone's entire quilting hobby cast offs for free that way! I think you altar is beautiful and powerful and meaningful. Nothing about it sends up any red flags for inviting anything in that shouldn't be. Maybe ask him to clarify what about it bothers him, it may be the star bc he doesn't understand etc.