Any and every person on the planet holds one or more beliefs or opinions you will disagree with. Singling out religion as one harmful dark and sinister belief is absolutely baseless.
Other beliefs and opinions often have at least some rational basis and are subject to debate, religion does not. Furthermore, religion is directly responsible for much death and suffering throughout history, even into the present day. Other beliefs and opinions have nowhere near that death toll. So no, focusing on religion is not absolutely baseless. At all.
It's particularly hard to understand this view today, when religious views are hardly ever deciding factors in legislation.
Whether it's the deciding factor in your country is irrelevant. Religion drives a great many political ideologies which still cause harm to this day, including abortion and LGBT oppression. Regardless of whether votes ultimately fall along religious lines, we wouldn't even be wasting time on these issues if it weren't for religion.
Where is the great harm that all these damn religious politicians are causing?
Wow, seriously, open your eyes. Even if you're British or Canadian where the religious right isn't nearly as rabid as they are in the U.S., they still influence legislation to the nation's detriment.