late night conversations

Tonight i had a long talk with my sister Emma. For once i was able to understand where she was coming from religion wise. This is ironic because i just had a conversation with Carolyn mere hours earlier about how to talk to my sister about God, and she just opened up. And you know what? I'm stumped. So confused. Why? Because my sister's questions make sense. Me. I'm supposed to be all wise, or rather God is supposed to give me answers. And to be completely honest i'm a little angry with Him right now. Because as my sister reasons and doubts and wonders what is really going on ( for the record she believes in an "energy" like karma, but mixed with the mormon belief that everyone goes to some kind of heaven),  i'm right there with her. Her questions, what makes christianity right as opposed to other religions makes sense. She said "well its how you're raised. If you were raised in Islam you would believe it's right." and what do i have to say to this?!' NOTHING. because i have the same doubts as she does.  I have the same questions, but i try to push them away. Serious doubts, and here my sister is having the same ones, and i'm supposed to lead her to a faith i have issues with logistics wise. Her questions, her reasons, i pray to God that he will give me proof, words to say that are wise so that she can understand. But understand what i know? i am not wise. i have so many questions still. She says prayer doesn't work. Sometimes i wonder too. Confession: i hardly pray for the things i really want, more along the lines of what i think i should want. For example instead  of praying that i loose weight and feel confident and get a boyfriend, i pray that God will take away my want of a boyfriend and instead replace it with a thirst for him and go on a diet, thinking that is something i can handle on my own, and i should want God more than a boyfriend. ANYWAY all this said, i still have major doubts. How am i supposed to help my sister? and sometimes i wonder, do i really want to help her? Her thought that God is selfish in wanting everything to be right in the world so that we can worship Him is not a question i haven't wrestled with before, and so i wonder if my faith is based on something substantial or me wanting to fit into a mold  that looks  appealing to me.  I'm so confused, and i just shove my doubts away for another day because i'm scared of what answers i will find.