New and scared

My husband has been in mental decline for most of this year and it has increased this past couple of weeks. At the mere mention of a GP he becomes erratic and is paranoid so believes I am, in his words, dangerous. I asked him to leave home but then realised that that sent him into even further erratic behaviour. He was raised catholic but in our 20+ yrs together hasn’t been in any way religious and is now telling me he has had a religious awakening 4 years ago and that God is talking to him and showing him the future. He said he has no time to discuss our relationship because he is busy doing important things for God under the guise of his business which isn’t off the ground yet nor has investment. I have asked him to return home tomorrow in the hope of just keeping him safe and calm but beyond that I don’t know what to do and I’m terrified of what the future holds. Any advice is appreciated