Right from the old and the new testament God has been there for those WO trust him why do you think that God can not make you his powerful massager and that cannot use you to do his will as he used some if his servants in the scripture.

Christ while he was on earth promised his desciples of the comforter whi is the holly spirit.
God from the old testament has always be there for his childreen in those days .life as christain should always be reflected by what the spirit says.
God has prepared the table before us all we need to do isto accept him in our life and every other things shall be added unto our life.
He can use you no matter who you think you are and what you do.
Believe that he can make you what he deserves