Why do christians call God as trinity ?

Christians say that god is one and at the same time they say God in Trinity, and Trinity in Unity, what does it mean, does it makes any sence. This idea of trinity came in 4th century and even bible doesnot has anything so call trinity. Why is it idea created by one but followed by every one without thinking... show more Christians say that god is one and at the same time they say God in Trinity, and Trinity in Unity, what does it mean, does it makes any sence.
This idea of trinity came in 4th century and even bible doesnot has anything so call trinity.
Why is it idea created by one but followed by every one without thinking about it.
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