Is it possible to enter kufr because of bad thoughts about Allah?

Lately, horrible thoughts about Allah have started popping into my head that are even scary to say. At any moment, my voice may appear in my head insulting Allah. These thoughts cause me great pain and I sometimes think that I will enter kufr because of them. I am afraid that this is seen as a mockery of Allah and that it takes me out of the religion. What should I do in such a situation? Am I out of the religion because of these thoughts?