This is an excellent question, and one I ask myself all the time. I struggle also to understand it. I will share with you what I have figured out so far, although it may not answer your question, or prove you wrong.
If "nothing shall be impossible" to those with even small faith,
I am not sure this is what was meant, or how faith works. Remember, you are dealing with faith here, and very broad topic in itself.
Read Hebrews 11 on the triumphs of faith.
Remember what Jesus told the woman who reached out and touched His robe and was healed? It was your faith that healed you.
You must believe by faith that the mountain will move. Not seeing the mountain move will give you faith.
The Wesley notes say this about the phrase mountain moving:
To remove mountains was a proverbial phrase among the Jews, and is still retained in their writings, to express a thing which is very difficult, and to appearance impossible.
I am not trying to cop out of the physical mountain moving thing, but I have to ask myself about it, as what I have seen in my life by faith, has been the proverbial mountain moving several times in my life.
If your faith actually is based in reality and you believe that the words of Christ are true, then why do Christians not perform impossible feats every day?
Like I said, by faith, I have moved spiritual mountains, ones that I would have never seen move without God, and faith.
But even after saying all that, I still ask myself the same question, why isn't there anyone here on earth that can move a mountain, and have that kind of faith?
BTW, I have stood at the base of the mountain, and tried to move it, I have stood by waters edge, and tried to part it. Each time I do this, my feeling from God is that it is not necessary, will prove nothing, so it won't happen at this moment.
To perform these events would change my mind in a heartbeat.
Then you wouldn't require faith.
God came to me in a most powerful way, and
I asked my wife, who has a very strong faith about moving the mountain, and her reply was, "I see no need to move the mountain. If I move the mountain for someone so that they could believe, they still wouldn't believe."
Surely a collection of the leaders of your "Christian Nation"
Leaders of a "Christian Nation" do not have anymore faith than you or I. They are only called to lead, or are born with the gift and charisma to lead.
I maintain that it is not done because it cannot be done because it is impossible. Is there no amount of Christians on Earth reading these pages that will step up to the plate and do that which the central figure that they claim to believe in emphatically states they are capable of doing?
No one on this earth will make you believe. You have to do it yourself, or God will help you along.
edit* I also think the main part of this verse is to point out their unbelief, not to point out moving the mountain.
Edited by riVeRraT, : No reason given.