Question

Is there definite and concrete-evidence that God exists?

Answer 1

No there is no concrete-evidence that God exists but, it is more of something you want to believe and hope is true i guess.

Answer 2

There is not definite or concrete evidence that any god exists. God is just a placebo people use to rid themselves of their insecurities. The only "evidence" of god is the bible, however the only "evidence" that the bible is a valid book is that god wrote it. This is called circular logic, it does not work. 

The existence of the christian god is most definitely not valid. 
Their god is described as omnipotent and omnibenevolent.

Omnipotent = Capable of evil
Omnibenevolent = Not capable of evil

Using this definition to describe someone has the same amount of accuracy as saying that there can be a square circle.

Another contradiction is the myth of free will in the bible. The christian god has apparently given everyone free will, yet he is all-knowing. This means that he knows exactly how you will live your life, moment by moment. This is a contradiction, if he is all-knowing, then you do not have free will.

Overall, there is completely no definite and concrete-evidence that god exists. In fact, it is more probable that he does not exist because he, himself is a paradox.