Faith is the basis of Christianity. You must have faith to be saved and to go to heaven. So becoming a follower of Jesus means you believe that Jesus was the Son of God, died on the cross for our sins, and was resurrected on the third day. You don't get to heaven by being good, doing good works, going to church...or anything you can do. It's believing Jesus is who He said He is...the Son of God. It's giving Him your life and trusting Him with it. It's inviting Him into your heart and following Him.
"So faith comes by hearing [what is told], and what is heard comes by the preaching [of the message that came from the lips] of Christ (the Messiah Himself)." Romans 10:17
Faith comes by hearing a word from God. The "word from God" is a rhema word. A word spoken by God. Just like Abraham went to a land he didn't know. He heard God tell him to go! And he obeyed. That's faith. God still speaks a word to our hearts. We listen, hear, and obey. That's faith.
We can't please God without faith. Hebrews 11:6 We live by faith. Hebrews 10:38 When we walk in faith, it's no longer us living, but Christ living in us. Galatians 2:20 Because of our faith, we will do good works. (Not the other way around. We don't get faith because we do good works.) James 2:17 Some day, our works will pass through fire. Those done without faith will burn up. (Remember: we can't please God without faith!) I Corinthians 3:11-15 We must hold fast to our faith or we will fail. I Timothy 1:19 We are to be an example in our faith. I Timothy 4:12 Our goal to finishing this life well is to keep the faith. II Timothy 4:7 We withstand the enemy with faith. I Peter 5:8-9 Faith is the victory which conquers the world. I John 5:4
Faith is paramount to the Christian life. You can't start without it...and you don't end well without it. It's the way to God and the way to please God. You must come to God with faith.