It is possible that Christian God exists

How about 2 billion Christians who believe in the Bible and that their God exists? In fact all religions and the majority of the worlds 7 billion people believe God exists.

Idk why people appeal to this argument. Before Christianity most of the world was polytheistic. Did that mean the polytheistic gods existed? If reality is whatever the majority of humans decide it is, then boy has reality undergone some fluctuations over the course of history.

How about 2 billion Christians who believe in the Bible and that their God exists? In fact all religions and the majority of the worlds 7 billion people believe God exists.

Idk why people appeal to this argument. Before Christianity most of the world was polytheistic. Did that mean the polytheistic gods existed? If reality is whatever the majority of humans decide it is, then boy has reality undergone some fluctuations over the course of history.

Believing in one God or many God establishes the fact since the beginning of time the world believed in the supreme being or beings. Even today Christianity teaches the many manifestation of God in the Trinity.

Now we've moved the goal posts from "most people believe God exists" to "well most people have always believed godlike beings exist, anyway."

Let's just keep applying your "if most people believe it, it's true" logic to other stuff: 

When most people believed the earth was flat, it literally was flat, but popped into a sphere the instant most people began to believe it was round.

The sun, moon, and planets all revolved around the earth until most people began to believe in the heliocentric model; then the sun and planets halted their rotation around the earth, and the earth, which had previously been stationary in space, lurched into motion and began an elliptical orbit around the sun.

We see Gods creation everywhere whether we are wrong about its shape and size. We know there is a creator behind everything in existence. That creator can only be God because of the magnanimity of creation.

We see Gods creation everywhere whether we are wrong about its shape and size. We know there is a creator behind everything in existence. That creator can only be God because of the magnanimity of creation.

Okay so now we have abandoned the "if most people believe it, it's true" argument entirely. Progress.

New argument appears to be "But look around! GOD."