There aren't only 4 most important times in a Jewish person's life. Every life is different and will have different important occasions, but here is a list of things that might by on various people's individual lists:
four
Belief in God, in the Torah, in the existence of the soul, and in free-will and responsibility.
Michele Bachmann is a Christian but she says she considers her heritage to be Jewish because it is the foundation and roots of her faith as a Christian. She has traveled to Israel four times (once as a young girl and three times as a member of Congress).
24 (they will be 12)
Yes. All four of his grandparents were Jewish.
Persons with endocarditis, four to six weeks.
A quartet.
In the First Amendment of the Nuremberg Laws, Jews were not identified by their appearance or current religious belief, but anyone who had three or four Jewish (by religious affiliation) grandparents in records was considered a Jew. Thus even persons who may have converted to another faith, or did not consider themselves part of the Jewish community could be branded as a Jew.
Four... Or Five if you include the Champion.
look
4x4x4x4=256/4=64
Four cubed = 64.