Theism is not a religion, rather it is a belief in god(s). This can be a belief in a single God, as in Islam, Christianity, or Judaism (monotheism), or a belief in deities or multiple gods, such as Hinduism & many ancient religions.
Islam is a type of theism.
Christianity is a type of theism.
Judaism is a type of theism.
Theism can be unrelated to organised religion.

Theism is not the same as religion. Religions can be atheistic, i.e. Buddhism.
by geekchic April 15, 2006
Theism is the concept of a god. Theism is where theists and atheists come from. If you accept theism you are theist. If you don't accept theism you are an atheist. Babies are not atheists. Babies have no way to accept or reject the concept of a god. How can babies choose to be theist or atheist when they can't examine the evidence? Same goes for rocks, trees, cats and dogs. It has nothing to do with belief. Your belief or disbelief is the result of your choice, not the reason for it.
I am an atheist. After examining the evidence, I choose not to accept theism as a truth.
by Resident Atheist April 3, 2012
A belief in two equal and opposite deities, such as God and Satan. Heaven belongs 100% to God, Hell belongs 100% to Satan. The Earth is their battleground. Nature is Neutral. God and Satan work through human beings. In Christian Polar Theism, God became the man Jesus Christ to let Satan torture and physically kill Him in exchange for the souls of sinners who repent (desire to be sinless).
FORMER ATHEIST: Polar Theism explains away all my objections to Theism. Polar Theistic Christianity explains everything; I just got saved!
by Kahdlibber October 9, 2017
A belief in two equal and opposite deities, such as God and Satan. Heaven belongs 100% to God, Hell belongs 100% to Satan. The Earth is their battleground. Nature is Neutral. God and Satan work through human beings. In Christian Polar Theism, God became the man Jesus Christ to let Satan torture and physically kill Him in exchange for the souls of sinners who repent (desire to be sinless).
FORMER ATHEIST: Polar Theism explains away all my objections to Theism. Polar Theistic Christianity explains everything; I just got saved!
by Kahdlibber October 9, 2017
Perception that monotheism is a violation of pagan European traditions. Can take on occultist & antisemitic attributes.
Anarcho-theism views paganism as more than a lifestyle choice - - it is a defense of European culture and pre-Christian heritage.
by sandrashine May 28, 2017
Agnostic theism is defined as believing in the existence of a god, but not claiming to know for sure that this god definitely exists.
I wouldn't suggest paying attention to the other much more vulgar definition about agnostic theism
by I'm Kenny November 5, 2013
After hockey, beer, and maple leafs, Canadians prescribe to eh-theism as their religion of choice.
by LutheranLearner May 23, 2014