Does Reformed Theology assert that God made Abraham believe?

> And, behold, the word of the LORD came unto him, saying, This shall not be thine heir; but he that shall come forth out of thine own bowels shall be thine heir. And he brought him forth abroad, and said, Look now toward heaven, and tell the stars, if thou be able to number them: and he said unto him, So shall thy seed be. And he believed in the LORD; and he counted it to him for righteousness. - Genesis 15:4-6 > What shall we say then that Abraham our father, as pertaining to the flesh, hath found? For if Abraham were justified by works, he hath whereof to glory; but not before God. For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness. Now to him that worketh is the reward not reckoned of grace, but of debt. But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. - Romans 4:1-5 > This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith? Are ye so foolish? having begun in the Spirit, are ye now made perfect by the flesh? Have ye suffered so many things in vain? if it be yet in vain. He therefore that ministereth to you the Spirit, and worketh miracles among you, doeth he it by the works of the law, or by the hearing of faith? Even as Abraham believed God, and it was accounted to him for righteousness. - Galatians 3:2-6 Does Reformed Theology (RT) assert that God made/caused/enabled Abraham to believe the promise God made in a primary fashion? What I mean is, one might say that the giving of a promise creates an opportunity for the choice to believe without directly causing that belief to occur in the same way that the prohibition in the Garden of Eden created an opportunity for Adam to choose but God didn't make Adam disobey. I think that RT affirms the latter (please correct me if I'm wrong). Does RT reject the former and assert that Abraham in no way would or could have believed unless God enabled/gave that ability to him? If yes (which I am sort of expecting) then a good answer will explain why real choice occurred in Genesis 3 but not in Genesis 15 and also whether God activated something latent in Abraham or gave him something brand new. In other words, did Adam's ability to make an actual choice disappear from humanity, go dormant, or something else? Bonus points for explaining (if yes) why Abraham's first act with his God-given faith was to ask for proof of God's re-iteration of his promise from Genesis 12:7. If God gave Abraham faith to believe (which Abraham played no part in), why was it a faith that doubted? > And he said unto him, I am the LORD that brought thee out of Ur of the Chaldees, to give thee this land to inherit it. And he said, Lord GOD, whereby shall I know that I shall inherit it? - Genesis 15:7-8