There is no such thing as a lack of faith. We all have plenty of faith, it's just that we have faith in the wrong things. We have faith in what can't be done rather than what can be done. We have faith in lack rather than abundance but there is no lack of faith. Faith is a law.
Ask any great athlete or the concert pianist or the successful actor if they have arrived at the place where they need no further practice. They will tell you that the higher you climb in proficiency and public acceptance, the greater the need for practice.