Does God exist in Buddhism? I'm new to this site. So I'd like to ask a question about God.

Do Buddhists believe in the existence of a God?

Does Lord Buddha mention anything about this?
Unfortunately, this is one of the first questions people ask, especially if they are coming from a theistic background. As a result, many who require the belief of a 'God' as a precondition, turn away from Buddhism without even practicing and finding out for oneself. Likewise, many atheists also get turned off when they hear about hells/heavens/rebirth in Buddhism.

To answer your question, if by 'God', you mean a creator/omnipotent/all governing entity, the answer is No.

'God' is a Christian term. At the time of the Buddha, words like 'Mahābrahmā' or 'Brahma' were used to describe such concepts. Brahmajala sutta talks in detail about how this belief was originated. 

The concept goes directly against one of the core teachings of Buddhism: "Sabbe Dhamma Anatta" - all phenomena are non-self or devoid of a soul. 

Even a Jataka story questions the belief in such a being:

"If the creator of the world entire 
They call God, of every being be the Lord 
Why does he order such misfortune 
And not create concord?"

"If the creator of the world entire 
They call God, of every being be the Lord 
Why prevail deceit, lies and ignorance 
And he such inequity and injustice create?" 

"If the creator of the world entire 
They call God, of every being be the Lord 
Then an evil master is he, (O Aritta) 
Knowing what's right did let wrong prevail!"


Here's a related article: Buddhist attitude towards 'God'

Buddhism teaches that all misbeliefs(beliefs that block the path to Nibbana) are variations of 2 fundamental misbeliefs.


Sassata Vada - Eternalism
Uchcheda Vada - Nihilism


The belief of 'God' falls under the first category. 

Even though holding onto such a belief does not prevent one from being born in heavens(given that they do many good deeds), it does block the path to Nibbana(Enlightenment). That's why it is called Maggavarana. Buddhism has very little to offer to such people until they are ready to give up that belief.