1Jo 5:14 And this is the confidence that we have in him, that, if we ask any thing according to his will, he heareth us:
1Jo 5:15 And if we know that he hear us, whatsoever we ask, we know that we have the petitions that we desired of him.
The key is "according to his will". We can have faith to pray for anything that is according to his will.
But we don't always know WHAT his will is. The problem is with most Christians is that they just assume that a certain thing is NOT God's will and therefore they either don't pray for it or don't have the faith for it.
I think it's better to have the faith and pray when we don't know what God's will is than to not pray. I've seen God do miracles for people when I didn't think it was God's will. Furthermore, I have seen God do miracles for people who didn't feel they were worthy or weren't even worthy of it.
It is all about God's mercy and goodness to us. He even send His own son to take our punishment for us when we were dead in our sins.
Christ died for the ungodly. Christ also heals the ungodly.
One thing I differ with you on though is that people did believe because of the miracles that Jesus did and that was one of the reasons that he did them. He would rather that people believed on him just because of his words, and many did, but namy did not. For them he did miracles to prove his messiahship and to inspire faith in them:
Joh 10:37 If I do not the works of my Father, believe me not.
Joh 10:38 But if I do, though ye believe not me, believe the works: that ye may know, and believe, that the Father is in me, and I in him.
Granted there are some that Jesus did not heal and there were special reasons for that. But those were the EXCEPTIONS.
You can't assume that just because God doesn't do miracles in every case that he won't do one for you.
The fact is that God is a rewardeder of those that diligently seek him. There is something that YOU have to do in order to get something FROM God -- and that is to PLEASE HIM.
And what is it that pleases him? FAITH.
I have gotten things from God that I discovered later on that weren't even God's will. He did it just because he was pleased with my faith and I acted on that faith.
I have learned it is better to say: "Not my will, Lord, but thine be done". Sometimes God will "give you the desires of your heart , but send leanness to your soul". So when you have great faith, you must also have the wisdom to say, "Lord, if it be your will..."
God is no respecter of persons. Even people in the Family, and there are many good hearted and well intentioned people in the Family, get things from God because they believe they are doing God's will and they have faith.
But I don't believe that they get anything, as you say, because they are anything special, or they have any special powers, such as the keys, or because they are "children of David", etc.
About commanding God. Prayer isn't telling God what to do, but coming humbly, but boldly before the throne of grace and pleading, head and heart bowed and a pure transparent heart, not hiding anything from him and having faith and not wavering.
Mar 11:23 For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.