Jesus said to his disciples,
For truly I say to you, if you have faith like the grain of a mustard seed, you will say to this mountain, ‘Move from here to there’, and it will move, and nothing will be impossible for you.
And that means the amount of faith is not relevant. Mustard seeds are small! (See also Matthew 13:31-32, Mark 4:31-32.)
In other words, if you trust the truth you have enough faith.
Knowing the deception of the human heart, therefore, we expect that Christians and churches will sometimes get this all wrong. Beware anyone, then, who says you do not have enough faith.