Religion

Religion of Mutants
Over Christmas (suggesting they mutated before the second coming of Jesus) and Easter the Sewer Mutants gather in church to worship an unexploded nuclear bomb.

First Amalgamated Church
Created from the mergeing of most 20th Century religions. Led by Father Changstein el Gamahl

Robotology
Led by Preacherbot, Robotology has many customs. Sinners will be collected by the Robot Devil to spend eternity in Robot Hell, in New Jersey.

Church of Trek
A religion based on Stark Trek

The Monks of Shubah
Believe that God exists somewhere in the depths of space. Built a powerful radiotelescope in the Himalayas to try and find him. Fry managed to reach a being similar to this, who then sent Bender back to Earth. The Monks have been searching for 700 years. Strictly non-violent.

Vodou/Voodoo
Vodou has become a mainstream religion by the 31st century. This may have something to do with the increased number of zombies and may have been brought on by the birth of Zombie Jesus.
 * learn more on Wikipedia

Oprahism
A mainstream religion, probably started by, or for, Oprah Winfrey.

Space Catholicism
Led by the Space Pope. Nothing else known.

Robot Judaism
Believe that Robot Jesus was a well built robot, but not their Messiah.

Salvation Army
As a part of the armed forces, they collect weapons to give to the defenseless so they can be safe on Xmas Eve.

Robot Santa
Main article: Santa Claus

Robot Devil
Main article: Robot Devil

Preacherbot
Robotology's leader. He also makes himself available for weddings of other religions and life forms.

Father Changstein el Gamahl
Leader of the First Amalgamated Church, or it's New New York branch.

Kwanzaa-Bot
Every Xmas Eve, hands out the traditional Kwanzaa gift, a book called What the hell is Kwanzaa.

the remains of a computerised space probe that collided with God
He is user-friendly and thinks in binary. Mostly tunes out the praying. Is not all knowing, but is quite powerful.

"When you do things right, people won't be sure you've done anything at all."

Chanuka Zombie
Held a luau at the B'nai B'rith one Xmas Eve, inviting the likes of Kwanzaa-Bot and Santa (who at the time was actually Bender). Nothing else known.

Space Pope
Reptillian leader of Space Catholicism.

Metal Lord
Bender breifly served as God to the Shrimpkins, it ended badly.

Origin of the Universe
The origin of the universe is a big part of most religions. It seems that Nibblonians had already existed for 17 years before the universe was created. Nibbler explained the creation of the universe to Leela (it was not revealed to viewers) and she responded with "Then the meaning of existence-- [Nibbler acknowledges.] So every religion is wrong!"

Xmas
Xmas has moved away from it origins in religion (The second coming of Jesus in 2443), largely due to Robot Santa's construction in 2801. These days, the people of Earth huddle together in fear and do their best to avoid being attacked. While both Xmas episodes have focused on Santa, the Xmas comic featured a sub-plot with the Planet Express staff performing a play about The Story of Xmas. While the actual content of the story was unclear, it seemed to be a blending of the birth of Jesus from Christianity and A Christmas Carol.