MuslimWoman: Your (sorry) boyfriend is a loser. In his congregation he will gain status that HE "brought" a Muslim woman into what they call "the truth" (trademark/lie) of his religion. Very, very few, as you know, Muslims convert to a Christian religion. You are playing with fire. As you know it is against your religion to become a convert outside of the Muslim community. You will lose your status as you know it, to become his bragging point... that is one reason he is being unreasonable.
Haven't you asked yourself, why he hasn't found himself a nice woman in his own religion? Those who know him, obviously do not want him enough to bend to whatever he thinks they must do to have the dubious honor of being his wife.
Run. Run. Run now while you have the chance. He is showing signs of having a manipulate personality, already. He is not showing kindness or any understanding.
How has he shown you that he cares for you? Even loves you? Would you marry a man that did not love you?
You want to come to America? Once you are here, then what? Will you bring all of your family over for a visit or for eventual immigration or will you be stranded by yourself, looking to your husband as your only means of love, help and support? You cannot work and make money right away. Does he make enough or will he call you a burden and worse?
You do not know him. Your emotions and hormones and maybe watching too much American TV is what is giving you excitement at all the possibilities that can unfold for you. But what if that is all an illusion?
Why do you think he is that one "Mr Wonderful" for you?
How old are you? Are you educated? What were your goals growing up? How do you view your future? If you are honest with yourself, would you endure whatever good or bad will come with marrying this man? Do you believe at your age that this is your one and only chance to get to the USA only through this man?