Believe that the God who created everything we see and cannot see, created you to know Him. Acts 17:28 "for “‘In him we live and move and have our being’; as even some of your own poets have said, “‘For we are indeed his offspring."
Believe that God has a standard for how to live and we have all fallen short of the standard. The Bible calls missing Gods mark "sin". Believe also that the consequence for sin is death both physical and spiritual separation from Life which is God Himself. Romans 3:23 "for all have sinned and fall short of the glory of God," Romans 6:23 "For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord."
Believe that Jesus Christ is God in the flesh who came and took our place in death so that if we believe in Him we can have life in Him both spiritual and eternal because He truly loves us. John 3:16 "For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life."