I want a girlfriend so bad!!!?

Ok so this question has multiple parts. First off I've dated girls and never seem to have an issue attracting them. I'm cute (or so they say), nice, sweet, charming, etc... All of that coming from girls I've dated. My issue is I can't seem to keep a girl interested in me. How do i keep a relationship moving forward? I'm 16 btw and homeschooled so I have to actually ask girls out to be with them. I don't see them in school everyday. And my second problem is with a specific girl. I've known this girl for a long time (4-5 years) and we have never been more than friends. Recently I've noticed more and more how much I like her and how fun she is to be around. As a sidenote she is super religious. So I've talked to her about dating and as a quote she said "I don't think people should date until they are ready to get married". But she also said her mom would be ok with it if certain boys asked her out. I wasn't at all sure what to make of that? I also asked her to come with me and a friend of mine to the movies and then dinner afterwards. My friend had a date and I told her that when I asked her to come with us. She came with us and we had a lot of fun. I noticed she held eye cntact with me and got this really cute smile when she looked at me. Does that mean anything? Also I opened my truck door for her and she blushed a little. I'm not religious at all and idk if this girl is into me at all? Should I ask her out for real when I see her in a couple days? And if I do I was thinking that since she really likes narnia but hasn't seen the latest movie maybe I'd buy it and like invite myself over kindof or maybe see if I could talk my brother and his fianc� into watching it with us? My house is trashed as a result of moving right now so I can't invite her over and make a good impression. Thanks everyone!! And btw she's also 16 just about a month older than me.