I agree, God does not currently have any place in objective science. Scientists should really stop saying 'there is no God'... it makes them unobjective.
Scientists in general do not say that, though I'm sure if asked many would. Just because people place words into someones mouth does not mean they said it. I know of no scientist that has offered up commentary on God unless provoked to do so. People like Dawkins are not scientists as much as philosophers.
Since we can't prove or disprove the existence of God, the question of whether or not a person believes in God doesn't (or at the very least shouldn't) have anything to do with scientific reasoning.
No, that is not a scientific position. Science is based on observation. If god isn't excluded from that, then there is no science at all. Gravity is just god moving objects in an orderly way. What we see in a microscope is an .mp4 from heaven. The people around us are fabrications made by god for some reason we can not possibly understand, because he's god. etc. We have NO way to test to see if god is involved. Science can't prove there is no god. But, science works to find out how our universe works, and science has absolutely NO way to include god in how things work.
When someone says that, they clearly are not stating that as a scientific position. Science doesn't provide a way to address the issue of the existence of god. And, any scientist would know that. There are scientists who believe in god and scientists who do not believe in the existence of a god. I would address "there is no god" on the basis of religion, where god is valid to discuss. I might ask why they believe there is no god.