Child like faith can often be a difficult idea to really understand.  After all, we all have opinions of what a dad or parent is like and it is sometimes good and sometimes bad.  Add to this the responsibilities we get used to as adults while trying to have a childlike perception of a God we can't see and our work is cut out for us.
However, Jesus models it for us when He says that He does only what the Father tells Him to do, which eventually resulted  in a bloody and brutal sacrifice in our behalf.  So, one way we could look at our heavenly Father is to consider the selfless acts of Jesus and remember that He is not a selfish, self serving God, but rather a selfless and giving God.
If we can accept that Jesus is truly the example we have been given, we can begin to comprehend what a good Dad we have.