We like to keep it simple, so here is the long and short of it:
We believe that God is the most perfect, amazing being that exists. He exists in three distinct personalities or egos that are all equally God and have all existed as God for eternity. Our triune God is one in essence and yet three in persons: Father, Son and Holy Spirit. He is incredible!
Shortly after He made us and everything else we know, we broke His laws. This is what is known as "sin". Before we sinned, He warned us that if we were to sin, death would be the punishment. So, being true to His word, death came into the world and everything was affected by it. The way we act, think, and perceive reality was all corrupted.
God wasn't satisfied to leave everything this way, so He made a way for Himself to maintain justice and yet justify those who would have faith in Him. Jesus, God's Son and God Himself (fully man and fully God), died in our place so that we could be forgiven.
If we trust in Jesus' death on our behalf to save us, and turn from our sins, He'll save us from sin's punishment which is eternal hell! Moreover, He fills us with Himself and gives us power to live for Him until we see Him face to face! Its the most amazing news ever!