I would say that they are wrong. It is in human nature to wonder about spirituality. It's a part of us as much as they want to deny it. For instance, i may not have a common belief, but my belief hinges on death. In order for me to have what i hope for i must die. This belief has made me look forward to death, in a way, which helps in not fearing death but celebrating it. Also, it helps in building myself in reality. For my belief says that i cannot become what i am not. Therefore, say i want to be a mage with a good heart helping out the society i am in by using my powers for good. Well, i cannot become that if i am not a good person that tries to help people in this reality. All of that, plus more, is a positive of having beliefs.
Even a lack of belief is still a spiritual quest. Atheists have come to terms with that which helps them in its own way through life. So... i think just having a belief is a positive. You search everything about yourself in the journey... which is always a good thing to come to terms with who you are and the subsequent confidence you gain in knowing.
When it is bad is when it divides us. All together, religion can also be poison. That is why i don't like religion overall, or more specifically, give any credit that any one is the absolute truth. I'm an Omnist in the sense that i believe every faith is trying to define the ultimate spiritual reality... but, no one knows it by itself. The more people come to this type of realization of spirituality i think the better, personally. Bc then you can critique what isn't love, what isn't hope, and realize that is a flaw.
But overall, i think religion and spirituality is a positive. Most people are smart enough to know what is good and bad. The problem is that people with darker intent can misconstrue religious text to justify their hate... so in that sense religion is bad. However, i think people will find a way to justify their evil anyways... which is why i don't fully blame it on religion.