Cyrus King of Persia had no idea that God was going to use him to restore Jerusalem even though he did not know Him. God chooses whom He pleases to bring about His plans.
Ephesians 1:11-12 (KJV)
11 In whom also we have obtained an inheritance, being predestinated according to the purpose of him who worketh all things after the counsel of his own will:
12 That we should be to the praise of his glory, who first trusted in Christ.
Where does our help come from, it comes from the Lord.
Psalm 121 (KJV) I will lift up mine eyes unto the hills, from whence cometh my help.2 My help cometh from the Lord, which made heaven and earth.3 He will not suffer thy foot to be moved: he that keepeth thee will not slumber.4 Behold, he that keepeth Israel shall neither slumber nor sleep.5 The Lord is thy keeper: the Lord is thy shade upon thy right hand.6 The sun shall not smite thee by day, nor the moon by night.7 The Lord shall preserve thee from all evil: he shall preserve thy soul. 8 The Lord shall preserve thy going out and thy coming in from this time forth, and even for evermore.
Can God use those who would be most unlikely to help as well? Yes, he did with Cyrus King of Persia. Everything is a testimony to who God is. He restores all things and makes them new. Faith sees that mountain moved, it sees the waters parted, it feels the ocean beneath our feet as we walk on water, our thirst is quenched with streams bursting forth from desert rocks, righteousness rains down from the heavens and His glory covers the earth.
45 Thus saith the Lord to his anointed, to Cyrus, whose right hand I have holden, to subdue nations before him; and I will loose the loins of kings, to open before him the two leaved gates; and the gates shall not be shut;
2 I will go before thee, and make the crooked places straight: I will break in pieces the gates of brass, and cut in sunder the bars of iron:
3 And I will give thee the treasures of darkness, and hidden riches of secret places, that thou mayest know that I, the Lord, which call thee by thy name, am the God of Israel.
4 For Jacob my servant's sake, and Israel mine elect, I have even called thee by thy name: I have surnamed thee, though thou hast not known me.
5 I am the Lord, and there is none else, there is no God beside me: I girded thee, though thou hast not known me:
6 That they may know from the rising of the sun, and from the west, that there is none beside me. I am the Lord, and there is none else.
7 I form the light, and create darkness: I make peace, and create evil: I the Lord do all these things.
8 Drop down, ye heavens, from above, and let the skies pour down righteousness: let the earth open, and let them bring forth salvation, and let righteousness spring up together; I the Lord have created it.
9 Woe unto him that striveth with his Maker! Let the potsherd strive with the potsherds of the earth. Shall the clay say to him that fashioneth it, What makest thou? or thy work, He hath no hands?
10 Woe unto him that saith unto his father, What begettest thou? or to the woman, What hast thou brought forth?
11 Thus saith the Lord, the Holy One of Israel, and his Maker, Ask me of things to come concerning my sons, and concerning the work of my hands command ye me.
12 I have made the earth, and created man upon it: I, even my hands, have stretched out the heavens, and all their host have I commanded.