The error in your logic is that physical laws in general do not reveal their cause. For example, consider an object moving through space that becomes trapped in the orbit of a planet. After beginning its orbit, the satellite obeys Kepler’s 2nd law (i.e. conservation of equal area in equal time); however, nothing in this conservation law will reveal the origin of the satellite’s orbit. That is, Kepler’s 2nd law cannot tell you how the orbit began. (This parable was developed by my roommate, fyi).
John Henry Newman had some interesting insight on this question: "At length we go on to confuse causation with order; and, because we happen to have made a successful analysis of some complicated assemblage of phenomena, which experience has brought before us in the visible scene of things, and have reduced them to a tolerable dependence on each other, we call the ultimate points of this analysis, and the hypothetical facts in which the whole mass of phenomena is gathered up, by the name of causes, whereas they are really only the formula under which those phenomena are conveniently represented.” (Newman, Grammar of Assent, page 67).
Newman goes on to say that we all accept the notional proposition that causes require an intellect and will; in other words, the cause of conservation of energy is God’s will. I highly recommend Newman’s works to address the issues you’ve raised.
I will pray for your conversion to Roman Catholic orthodoxy.
-Ryan Vilbig
ryan.vilbig@gmail.com