There are probably many. I hope others will add to this list or correct my mistakes. Here are some:
Baptism - probably evolved from the Jewish ritual of Mikveh
The Old Testament - A Christian translation of the Hebrew Bible. Jewish sages of the middle ages influential in interpretation
The wearing of a gold wedding ring
wafers in church Communion - derived from Matzah; the Last Supper, the start of the tradition of Communion, was a Passover meal that should normally involve Matzah
Easter itself, of course, is a kind of an interpretation of the Passover; Pentecost is a kind of an interpretation of the Counting of the Omer, Whitsun an interpretation of Shavuot; Lent an interpretation of the Passover 'giving up' of Leaven;
in the sense, similarly, that
the New Testament is a kind of an interpretation of the Old Testament, the New Testament being the story of a man parallel to the Old Testament story of a people
Pope's skullcap is clearly very similar to a Kippah
Memorial candles
Many Christian denominations respect the laws of the Torah, such as laws against eating pork;
Seventh Day Adventists notably respect the Saturday Sabbath
the Catholic Church emphasizing the sanctity of Life, including the Life of the Unborn Child, has its origins in the original emphasis in the Hebrew Bible; even though some more modern Jewish interpretations are less rigorous than the Catholic Church's famous stance, some more modern Jewish interpretations areequally protective of Life
Neither Jesus nor his disciples ever quoted oral Jewish tradition to support their teachings but, rather, appealed to the written Word of God. (Matthew 4:4-10; Romans 15:4; 2 Timothy 3:15-17)
According to the New Testament, Jesus was Jewish, and virtually all of his teachings are distortions of things from the Torah.
Apostolic
The Scriptures, Rabbinical teaching, the Kingdom of God and being God himself.
Jesus and his disciples were Jews, and their teachings were initially rooted in the philosophy of Judaism.
It is difficult to determine which country has the most traditions, as traditions vary greatly across cultures. However, countries with rich cultural histories, such as India, China, Japan, and Mexico, are often recognized for their diverse and longstanding traditions that are deeply rooted in their societies.
The Schwenkfelder religion is a Christian denomination that traces its roots back to the teachings of Caspar Schwenckfeld, a 16th-century German theologian. They value personal religious experience, emphasizing the inner spiritual journey over external rituals and sacraments. The Schwenkfelder tradition has a small following in the United States, with congregations primarily located in Pennsylvania and surrounding areas.
It changed the way people thought about war; the message was that established values had been made meaningless by the savagery of WWI.
the Jewish custom of serving only unleavened bread during Passover season
Moishe the Beadle is an allegorical reference to the Prophet Jeremiah. Much of Dr. Wiesel's writings is rooted in Jewish religious traditions, reflecting the faith of his ancestors and the background in which he was raised. The character of Moishe is likely an amalgam of individuals with whom Dr. Wiesel had contact in his youth but the reference is clear to Jeremiah whom warned ancient Jewish society of the impending destruction of the Temple and the consequent diaspora resulting from the Babylonian wars.
Guatemala is a country whose religion is chiefly Roman Catholic and Protestant. It is deeply rooted in local traditions that make the celebration of Easter a colourful and massive one.
There were not any new religions in the Roman Empire from which Christian beliefs and customs were rooted. Christianity itself was a new religion. Originally it was a sect of Jews and it was rooted in many of the beliefs and customs of Judaism. Then it strove to differentiate itself from Judaism. Judaism was an old religion, not a new one.