Believers
A believer is someone who believes that Yeshua is his own Messiah. If you don't believe that, you're an "unbeliever."

The belief we're talking about is more than just saying, "Hey, yeah - that sounds reasonable!" If, for instance, I say to you "It's raining" and you don't walk out of the house with an umbrella, you may have said "OK" but you really didn't believe me. To believe that Yeshua is your Messiah means:

   You know what a Messiah is. The ancient Jewish prophet, Isaiah, said that this Messiah would take upon himself our iniquities, our rebellion against G-d and suffer in our place. He would offer a sacrifice like the ancient Jewish priests, not of animals, but of himself. (Isaiah chapter 52, verse 12 to chapter 53, verse 15)
   You need a Messiah. If you don't think you need one, you don't really want one. The only way you'd need a Messiah is if you are separated from G-d and helpless to remove the baggage of all the evil things you had ever done. If you think G-d will just overlook that, you're wrong. G-d is a just and holy G-d. Someone needs to pay - wanna volunteer? (Isaiah chapter 53, verses 5-6)
   Yeshua is that Messiah, the long awaited rescuer of Israel and the entire world.
   You trust that Messiah to save and sustain you. You believe that he rose from the dead and is alive today.
   You dedicate yourself to learning about this Messiah and letting G-d make you more like him every day.