Many times I ve asked myself that,where is God without any answer.so can u tell me where is God in science only and where did he come from and why?

Well being an atheist I believe there is no god. The fact is friend that unfortunately for your belief there is no "god in science" as you put it, no there are things that we cannot yet explain, some people call these miracles but you have to remember that 200 years ago we couldn't explain the science behind why we were held to the earth (which was only just becoming widely accepted as being round). I think in a certain way we humans are our own god, as a species we kind of act as one all working toward a common goal, what's the meaning to life? It's what you want it to be, what you want to achieve in your short century on earth.

If you believe in a God, he can not be explained, put in a test tube and provened. Religion of any type is based on faith, not science.

First God would not have a start or end, he would not come from anywhere, but always be.
You have to free yourself of human, ideas and beliefs of time, time must not exist for a God.

Where, you also have to free yourself from the idea of 3 or 4 dimensions and the ability to only be in one place at one time.

The issue with science trying to prove God, is that it has not advanced to a stage where it can understand God yet.

Science 200 years ago, could not have explained a rocket ship, so science today has not reached a point to understand God yet either