What kind of question is this ?  " How can we trust God?"  Who ever asked this question must not believe in God or know anything about him.  My answer to you is:  Go to the library and read about God. There is a lot of information out there about God.  I would ask you to read the Bible but if you are questioning  Gods trust then you would not understand the Bible at this time of your life.  First you need to read about God so you know who he is, how he came here and what he went through for us.  If you knew all there is to know about God, you would not ask such a ridiculous question.  After reading and educating yourself about God, start reading the Bible.