In answer to your question, "Can a Reform Jew believe that God gave the Torah at Sinai?" I think that the most honest answer is, "Yes, but..." Let me start with that "but.
In the Jewish prayer book, the siddur, there are references to an “end of days”: the Temple in Jerusalem will be rebuilt, the dead who were righteous will be resurrected, and a figure known as the Messiah, or in Hebrew the Moshiach, will restore Israel to new-found glory.
I’m Jewish and my partner is not. We’d like to have a Jewish wedding and plan to raise a Jewish family. Will a Reform rabbi or cantor officiate at our wedding?