Approximately thirty years ago, a synagogue named Temple Beth Am was started to meet the needs of constituents in the Las Vegas Valley who wanted to worship at a Reform congregation.  In the early days, meeting sites for the congregation moved to various locations throughout the city and included a church across from UNLV, the Student Union at the university, and even a Mormon Church. As Temple Beth Am grew, its congregants set their sights on having a building of their own. Through the hard work and dedication of their original members, the congregation succeeded in getting a parcel of land donated in the Summerlin Area of the Northwest Valley.

Initially, portable structures were moved to the site until permanent buildings could be constructed. As is usually the case with most organizations, there was some disagreement over the future plans for Beth Am. Subsequently, a group of congregants splintered off and formed a new Congregation which they called Adat Ari El. This group met in an office building and started with about fifteen families. Meanwhile, in 2001, the construction of the permanent buildings of Temple Beth Am began. It was an ambitious project with a preschool, event center and senior center as part of the campus.

In 2007, at the biannual conference for the Union for Reform Judaism (URJ), the president of Beth Am and the vice president of Adat Ari El sat down and had lunch together. Old animosities were tossed aside and they began a dialogue about how they could better serve the Jewish community by combining their efforts and resources. They realized that the two congregations shared the same core values and that joining together would be beneficial for their congregants, as well as the community at large. Hence, Temple Sinai was born.

Joining the two congregations together was a huge success. The members of the two synagogues were still acquainted and the transition seemed more like a family reunion, than a merger of two separate entities.  Word spread throughout the Las Vegas valley about this new Reform congregation and membership began to increase. Today, Temple Sinai is a growing and thriving community that has established a comfortable, participatory environment focused on education and social action. The synagogue offers wonderful adult education classes, innovative programming, and a vibrant religious school.  It continually strives to improve the local community, while building on the Jewish tradition of tikkun olam (healing the world).