Mustard seed faith represents faith that starts out very small but grows. A mustard seed is a very small seed that grows into a large plant. We know that Jesus was not literally speaking of moving a literal mountain. When we face mountain-sized difficulties in life as the disciples had just done with the demonized boy, we are to remember that faith is the key. Instead of worrying, arguing or whining we should drop to our knees and fully surrender to God.
Prayer is the key.
Folks, in many ways we are just like the disciples. We know the traditions. We have programs for every conceivable type of ministry. We understand the need for prayer. What we need is to just do it.