It's not as simple as black & white. Just like every human being is unique, every one's thoughts are also unique. No two people think alike. They may share or have similar likings, but when you state 'evil thought' that is a vague statement. What you consider 'evil' may not be evil to another individual. So you stating 'Does evil thoughts make you evil', how would one person's definition of 'evil' be as equal as the next?
You also include 'evil' and 'god' in your question. There are many, many, religions and beliefs in this world. How can your definition 'god' be the same as another's religion or beliefs?
My opinion regarding what I consider what 'evil' people are, is those which do wish for anyone else to be happier than them. Those which do not wish for others to have more than them, or to have better than what they have. Those who 'choose' to not help those who are in need. Those only worry about themselves, without any consideration for any one else. Those who practice the definition of being selfish and egotistical.
Those are people that I consider evil, rotten, and cruel.
I wouldn't say it's a question of evil..., but more of a question of greed.