Greek Orthodox and Syrian Orthodox are two separate branches of the Eastern Orthodox Church. The Greek Orthodox Church is one of the oldest Christian denominations, tracing its roots back to the early Christian communities in Greece. The Syrian Orthodox Church, also known as the Syriac Orthodox Church, has its origins in the ancient Christian communities of the Middle East, particularly in Syria and the surrounding regions. Both churches have their own distinct traditions, liturgies, and hierarchies, but they share the same core beliefs and are part of the larger Eastern Orthodox communion. **

The difference between orthodox and ultra-orthodox lies in the level of adherence to traditional religious practices and beliefs within Judaism. Orthodox Jews generally adhere to traditional Jewish law and customs, but may also engage with modern society to varying degrees. Ultra-orthodox Jews, on the other hand, tend to strictly adhere to traditional religious practices and often live in more insular communities, with limited engagement with secular society. Ultra-orthodox Jews also typically place a strong emphasis on Torah study and religious observance. **

Orthodox Christians do not live according to the Old Testament in the same way that ancient Israelites did. While they hold the Old Testament as a sacred text and draw inspiration from its teachings, they also follow the New Testament and the teachings of Jesus Christ. Orthodox Christians believe in the fulfillment of the Old Testament through the life, death, and resurrection of Jesus, and they seek to live according to the teachings of the entire Bible, both Old and New Testaments. They view the Old Testament as a foundation for their faith, but also recognize the importance of the New Testament in shaping their beliefs and practices. **

Professing the Greek Orthodox creed alone does not automatically make someone Greek Orthodox. Becoming Greek Orthodox typically involves a process of instruction, baptism, and chrismation, as well as a commitment to the teachings and practices of the Greek Orthodox Church. Professing the creed is an important part of this process, but it is not the sole factor in becoming Greek Orthodox. **

No, Orthodox Christians are generally not circumcised. Circumcision is not a common practice in Orthodox Christianity, and it is not considered a religious requirement for Orthodox Christians. Circumcision is more commonly associated with certain other religious and cultural traditions, such as Judaism and Islam. **

Yes, it is generally permissible for a Russian Orthodox believer to attend another Orthodox church. Orthodox churches share the same faith and sacraments, so believers can participate in services and receive the sacraments in any Orthodox church. However, it is important to be respectful of the traditions and practices of the specific church being visited. Additionally, it is recommended to inform the priest of the visited church about being a member of the Russian Orthodox Church. **

Yes, it is generally allowed for a Russian Orthodox believer to attend another Orthodox church. Orthodox Christians believe in the unity of the faith and the sacraments across all Orthodox churches, so attending a different Orthodox church is seen as participating in the same faith. However, it is important to respect the traditions and practices of the church you are visiting. **

The main difference between the Russian Orthodox and the Greek Orthodox Church lies in their historical and cultural backgrounds. The Russian Orthodox Church is based in Russia and has been influenced by the country's unique history and traditions, while the Greek Orthodox Church is based in Greece and has been shaped by the country's own historical and cultural developments. Additionally, the Russian Orthodox Church has its own patriarch, while the Greek Orthodox Church is headed by the Ecumenical Patriarch of Constantinople. Despite these differences, both churches share the same core beliefs and practices of the Eastern Orthodox tradition. **