Help what should I do my girlfriend wants to wait until we are in engaged before kissing?

Me and my girlfriend started dating about a month ago and talked for about a month before that. I am a freshmen in college and she is a sopre in college. We are both very big Christan's. Every thing is going great we hold hands, hug, snuggle together, and even kiss on the cheek, but she doesn't want to kiss on the lips until she is engaged. she believes it will lead to before marriage. I don't want to wait that long before kissing but i agreed to it because i really like her a lot. I don't think little pecks on the lips is bad, and i would like to some how convince her that they aren't bad. How can i do this without upsetting her or making her mad?