Orthodoxy is the true judaism and where a jew should be.
Another reason for jews to come is because they are living as a result of promise made by Jesus to Abraham, thata Abaraham would have children like numbers of stars. Jesus name before adopting human nature for salvation of humanity. Jesus name at that time was Word of God. Jesus names jews as "My own". Where Word of God that gave them life is, Jews must be too. Genesis 15:1 tells clearly about Word of God that will take the nmame of Jesus, making the promise to Abraham.
GEN 15:1 After these things the word of Yahweh
came to Abram in a vision, saying, "Don't be afraid, Abram. I am your shield, your exceedingly great reward."
GEN 15:2 Abram said, "Lord Yahweh, what will you give me, seeing I go childless, and he who will inherit my estate is Eliezer of Damascus?"
GEN 15:3 Abram said, "Behold, to me you have given no seed: and, behold, one born in my house is my heir."
GEN 15:4 Behold, the word of Yahweh
came to him, saying, "This man will not be your heir, but he who will come forth out of your own body will be your heir."
Jeremiah 31:34 tells you about a New Law and Daniel tells you about Messiah comming before temple was destroyed, that is before year 70. Also book of Adam and Eve talks about Messiah comming in year 5500 from Creation which happen on the time of Jesus.
Comming and leaving is so dangerous that not comming may be better if you are unsure. Dangerous is also not comming that is to go in after life without immortality.
If a good neighborhood in after life is important for you then comming and not leaving is the option. Otherwise, karate ,jiujitsu, judo since you may have to fight not with gladiators, lions, SEALS, and so on, with somebody more terrifiant, the sick angels.
Wikipedia Sheol tell jews not comming that training in jujitsu is mandatory, that is everybody in their faith goes to Sheol in after life... Gnashing of teeth is not because of happy life.http://en.wikipedia.org/wiki/Sheol
"Sheol ( /ˈʃiːoʊl/ shee-ohl or /ˈʃiːəl/ shee-əl; Hebrew שְׁאוֹל Šʾôl) is the "grave", "pit", or "abyss" in Hebrew. She'ol is the earliest conception of the afterlife in the Jewish scriptures. It is a place of darkness to which all dead go, regardless of the moral choices made in life
, and where they are "removed from the light of God" (see the Book of Job). In the Tanakh sheol is the common destination of both the righteous and the unrighteous flesh
, as recounted in Ecclesiastes and Job."
So in the end, the true question is what is somebody doing outside Eastern orthodox Church, that gives you safe neighborhood, good life in after life?