What is "this reason", concerning the certainty of Faith's outcome, which causes whatever you pray and ask for to become yours?

Reason is the cause or explanation of an event, situation, or some other thing. e.g. What is the reason for not going to church. Explanation - The reason is I don't believe in religion.

You are reading too much into what is fundamentally basic understanding. Faith is belief in something. Read the passage again. Jesus said: For this reason (that is why) I say to you, whatever you pray and ask (for), BELIEVING that you have received it; it will be yours.

We all know subconsciously that we have to change our brain's neuron connections of self preservation into only having Godly habits if we want to escape that place where Jesus said there is weeping , wailing , and gnashing of teeth .

Jesus does a lot of things for certain ones he feels he can get the biggest audience to listen to him from ( for which because he simply made a sincere covenant with the Father that he would always obey all of the words God gave to him to be written in the New Testament THEN he was given the power to do anything he wanted , and he knew it well , but also he knew he would set aside his last week on earth to have to be persecuted and bare the cross so he would grow to be Godly enough to at least get what he wanted out of his work for God ) because of his selfish desire to be known as the greatest evangelizer the world will ever know, and that no one could come unto the Father but by obeying all of his sayings .

The "reason" concerning the certainty of Faith's outcome is Christ Jesus, and him resurrected.

We are saved by faith based on the merit of Jesus Christ who died for us. In a great exchange, our sin was placed on Christ, and His righteousness was placed on all who have come to saving faith in Him. The result of being born again and indwelt with God’s Spirit is that He begins to change believers from the inside out. That inner change becomes outwardly visible by a transformed life, a life lived in continued faith and increasing obedience (Matthew 7:21).

The fact that our Redeemer lives is the reason for our confidence. We know that whatever we ask for, in His name (and that is in accordance with God's will) shall happen. Our eternal security (the old Reformed term is perseverance of the saints) enables us to persevere because the God who saves the believer is also the God who keeps the believer safe and enables him or her to continue in faith and good works (Philippians 1:6).

Actually Jesus says a lot more than that about praying and faith and pure intent. We need to read all of what he says to have an accurate description of how to pray for others.

If any people of any religion had enough faith to move a mountain with it, there would be no other religions.

There would only be the one. Yet this is not the case at all. What gives?

Sorry, is this actually a question, or do you just like regurgitating scripture for no apparent reason?