Hopefully making theology simpler to understand! (2 Corinthians 1:12)

For with the heart one believes and is justified, and with the mouth one confesses and is saved.
Romans 10:10, ESV

Some confess without ever believing. Some believe and are not able to confess.

However, it does take faith, and we are commanded to share (if possible) that Jesus is our Redeemer and Lord. (Matthew 28:18-20)