What does it mean to "believeth" in someone?

To believe if we believe in Jesus Christ then aught we not to follow his example and do even as he has done. Then we need to follow the example of Jesus Christ and in keeping the commandments. Believe that if ye do this then ye shell have eternal life in our heavenly fathers kingdom. Only thru obedience can we be saved if ye believe, do ye believe and if ye do then put your trust into your heavenly father and see what he is willing to do for you.