Reconstructionist services have about the same amount of Hebrew as a Conservative or Traditional Reform service (75% to 90% Hebrew). Some even have more.
The Tanakh (Hebrew Bible) and the Talmud are the most authoritative. Pretty much everything else is derived from these two.
Declared as a Jewish language? An odd turn of phrase. Hebrew is and has always been the language of the Hebrew Bible and Jewish prayer. A century ago, Hebrew was to Judaism as Latin was to the Catholic Church, but around that time, a group of Jews in Palestine decided to speak only Hebrew in their homes, and as a result, a generation of Palestinian Jews grew up speaking Hebrew as their native language. As the Palestinian Jewish community grew and then became the modern state of Israel, Hebrew became an official language of Israel, alongside Arabic. Much more recently, right-wing element in Israel have pushed to reduce the use of Arabic in Israel as a nationalist measure to de-legitimize Israel's large Arab minority.
One can find information about Black Hebrew Israelites on Wikipedia where they have much information on their history. Information can also be found on the 'Jewish Virtual Library'.
You usually have a mother and/or a father, and one or more children. A Jewish family has as much variation as any other family.
Under Orthodox law, the kids cannot be Jewish unless the mother is Jewish or they get a proper conversion from an Orthodox rabbi. This answer holds also for the Conservative Movement. In 1983 the Reform Movement in the United States passed a resolution stating that a person with one Jewish parent is under a "presumption of Jewishness" which is confirmed by "public, timely acts" of identification. This has come to be called "patrilineal descent" or "equilineal descent." The Reconstructionist Movement, which is much smaller, also holds this view. So whether or not the kids are considered Jewish, if their mother is not Jewish and their father is, depends on what Jewish community they are in.
Someone who'd never been in a church or synagogue would see strong parallels. A congregation gathers, they sit down at some times in the service, stand at other times, sing hymns, pray, listen to readings from their holy books, listen to teaching or sermons, and have a procession or two during the service. If you look closer, you'd notice that a synagogue service typically involves a considerable amount of Hebrew, and that much of the Hebrew is chanted, and that Jewish liturgical chants are frequently in a minor key. In your typical Christian service, only the minister wears anything resembling vestments. In contrast, in Jewish daytime services, many in the congregation wear prayer shawls that can strongly resemble vestments, and all the men in many congregations wear little caps. Jewish morning services are long compared to what most Protestants and Catholics expect. A Sabbath morning service can easily last from 9:30 AM to noon, with most of the congregation staying for another hour to eat lunch after the service.
Jewish people tend to be of the Hebrew nation, and are the people of Abraham, Issac and Jacob. They are the people of Israel. Jacob's name was changed to Israel, and all of Jacob's descendants became the nation of Israel. It should be noted that Hebrews and Jews, while usually embodied by the same people (with exceptions), do not have the same definition because Judaism is a religious faith and Hebrews are of the Hebrew and Israeli nationality. So as many people who would call themselves Jewish are also Hebrew, and many people who call themselves Hebrews are also Jewish, they are not one and the same. Much like a Roman is not synonymous with a Catholic. Hebrew is a word that actually means one who crosses over, as in crosses over from Egypt.
Five Jewish holidays fall in September or October:Rosh Hashanah, the Jewish New Year. Begins on the 1st day of the Hebrew month of Tishrei. Orthodox and Conservative Jews celebrate 2 days, Reform and Reconstructionist celebrate 1.Yom Kippur, the Day of Atonement, on the 10th day of Tishrei. Jews fast on this day, refrain from work, and generally spend much of the day in Synagogue.Sukkot, the Feast of the Tabernacles. Begins on the 15th day of Tishrei. A 7 day holiday in Israel, an eight day holiday everywhere else. Jews build small huts outside their homes, and eat (and in some cases sleep) in those huts during the holiday.Shemini Atzeret, A Solemn Day of Assembly on the 22nd Day of Tishrei.Simhat Torah, A celebration of completing the Torah on the 23rd Day of TishreiThe latter holidays usually fall in October while the earlier ones usually fall in September, but since these dates are based on the Hebrew calendar, they can move a few weeks up or down on the Gregorian calendar.
"Thank you" in Hebrew is pronounced "toe-DAH"."Thank you very much" in Hebrew is "toe-DAH rah-BAW".
Synagogues may differ in many ways: What prayerbook do they use? Each of the major streams of Judaism publishes at least one prayerbook, and there are older editions and competing prayerbooks to contend with. Then, there is the matter of local tradition. A classic Jewish in-joke is "I went to the synagogue down the road. They use the exact same prayerbook we do, but they stand up at the wrong time, sit down at the wrong time, and use all the wrong tunes!" That's true, since most Jewish prayerbooks only give the words, not the melodies, of the parts of the service that are traditionally sung. Then, there is the issue of gender roles. Orthodox synagogues separate men and women and do not allow women to lead services where men are present, while liberal synagogues generally do not segregate by gender. Finally, there is the question of language. Outside of Israel, most Jewish prayerbooks are bilingual, printed in Hebrew and the local language. But how much of the service is in Hebrew? Traditional Jewish law permits praying in one's native language, but some synagogues do everything in Hebrew -- usually Orthodox synagogues use more Hebrew, while Liberal synagogues use more of the local language, but there are exceptions.
Hebrew is a language of the Afro-Asiatic family, spoken by about 6 million people, either as a first or second language (mainly in Israel). Jewish describes an ethno-religious group of people, who mainly practice Judaism in one form or another, although there are also secular Jews. Some people also use the word Jewish to describe the Yiddish language, which is a dialect of low German influenced by the languages of 11 different European countries. This is a somewhat inaccurate use of the word 'Jewish', though, since there are other languages spoken by Jews that are also sometimes called 'Jewish'.
English names don't change pronunciation much when spoken with a Hebrew accent. Judy sounds pretty much the same in Hebrew as it does in English.