Beginning to hate my Dad.

My Dad over the past year has changed alot. He is Schizophrenia and will not stop talking about how the Vatican is trying to kill him. He also thinks that Hitler and and the Italian Dictator from WW2 is in on a plot in killing him. He thinks the Pope influenced WW2. He is trying to make me and my siblings convert to Judaism even though we are Christians. My father has had some issues with my mom and now sleeps in the Living room on a matteras which he thinks was put there to kill him like Jews were in Gas chambers in WWII. I don't understand what is wrong with him and what i could do to help him. It has got to the point where me and my siblings hide in our room to avoid my Mom and Dad arguing. Please give me some good advice.