Your question has two parts. Belief and God.

Lets take belief. Believing means we do not know for a fact. Thats why i need to believe. Else what is the need to believe. For e.g there is Sun rise and we all see it shining daily. So you will not say i believe there is a Sun. So is belief the truth? It cant be. For truth has to be universal. So your question should not be about belief in God. Some may say they believe. Some may say they dont. But both will be beliefs which is not the truth. They have not yet found out.

Now you may say that it means everything has to be proven. Like Science. And hence only what science says can be true. Because scientific laws apply to everyone and they dont deviate. But science only deals in matter. That which is tangible. So only science cannot be an answer.

In any experience there is outside and the inside. What you experience is related to outside. But what you are is the inside. Science does not deal with the inside. The inside can be only known by you. It cannot be measured by science.

So my suggestion would be that you need to find out for yourself. If i tell you there is God, its not going to help you. Because you will again take this for face value and make a belief out of it. And the same thing will happen if i tell you that there isnt any God.

But what i can tell you for certain is that it can be found out. For that you need to know who you are? You need to know your own Self. Only then can you find out the truth about God.