For by the grace given me I say to every one of you: Do not think of yourself more highly than you ought, but think of yourself with sober judgment, according to the measure of faith God has given you. — Romans 12:3

God has given each a measure of faith. It's not the same measure for everyone—and that's by design. Welcome the weak in faith without quarreling. Jesus catching Peter and saying "O you of little faith, why did you doubt?"—even a small faith is still faith in a big Savior. Jude 20 tells you to build yourself up in your most holy faith.