Luke 17:5 And the apostles said unto the Lord, Increase our faith.
What is important is who we have faith in.
Luke 17:6 And the Lord said, If ye had faith as a grain of mustard seed, ye might say unto this sycamine tree, Be thou plucked up by the root, and be thou planted in the sea; and it should obey you.
A small faith as a mustard seed in the mighty God is enough. The sycamore has a deep root. Speaking earlier of forgiveness. Many have been hurt or abused and have grown deep roots of resentment and bitterness.
Heb 12:15 Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled;
Through faith in Jesus it can be uprooted and cast into the depths of the sea.
Micah 7:19 He will turn again, he will have compassion upon us; he will subdue our iniquities; and thou wilt cast all their sins into the depths of the sea.