My mothers new husband is really moronic.?

mothers new HUSBAND is a moron!!!! I leave her home for 4 months and she's already married, it's not she's married that bothers me it's who she married. She married an uptight religious moron.... But let me tell you where it started that I began to say this about him. I arrive home for my birthday for a visit last week Dec 18, and I stay with my mother for the week. Great birthday, but anyways a day later I'm on the couch watching television and then the door opens and I hear someone yelling at me WHO IN THE NAME THE LORD ARE YOU?!! and I say What do you mean I used to live here who are you? My mother walks out of the kitchen and she tells him honey honey this is my son!! And then he says well very to nice to meet you young man. And I'm still thinking about honey?? Like what? So I ask my mom is he your bf or something and the guy interupts and states HUSBAND. Get this she's not only married but pregnant too!! Then my little sister walks out and tells me to come to the room, but before that the guy says dear have you finished reading your bible? She says no, and he says you your not allowed to do anything until your done, and Im like WHAT?!?! So I get my sister and say Sir my sister doesn't read the bible and your not her father you don't command her!! He says I believe you need the help Jesus aswell. Then I say please please shut up I've met countless morons like you, you have some nerve trying to care for my sister this way not to mention getting my mother pregnant. Then my mother speaks up and tells me to stop this fighting that we are angering the lord? I'm baffled my mother never spoke like this before I left there was no trace of this guy. Then I left,thinking what had changed since I left, the next day I get a phone call from my sis, telling her to pick her up from church?On a THURSDAY?!?! So I drive over there and pick her up but now I'm lost should I care for my sister I mean I have my own home good job enough money to do it but my mothers brainwashed help?