Opinions don't affect facts. But facts should affect opinions, and do, if you're rational
We shouldn't even need the word 'atheism'. If people didn't invent ridiculous imaginary gods, rational people wouldn't have to deny them.
Science seeks the truth. And it does not discriminate. For better or worse it finds things out. Science is humble. It knows what it knows and it knows what it doesn’t know. It bases its conclusions and beliefs on hard evidence -- evidence that is constantly updated and upgraded. It doesn’t get offended when new facts come along. It embraces the body of knowledge. It doesn’t hold on to medieval practices because they are tradition.
I love how people walk around with crucifixes, skullcaps, pointy hats, funny beards and then say 'you should keep your atheism to yourself.'
Saying atheism is a belief system is like saying not going skiing is a hobby.
Atheism is the lack of belief in a god (or gods). It makes no claim. It merely rejects the claim that a god (or gods) exists. Nothing more.