No, seeking truth is a human impulse - to describe it as essentially a religious quality is to try to co-opt it for the benefit of dignifying religion. Along the lines of how many Muslims say 'science is Islam', 'secularism is Islam', etc etc etc, to use an example.
Religions as a whole are a result of people trying to reach that truth. Which is why major religious founders have been said to have meditated, and why meditation-like states are so important in many religions. We (humanity in general) need them because, in some way or the other, we need to find comfort and solace otherwise we'd go through a mental breakdown, and religions provide that. So does other stuff: music, literature, etc etc.
Religion is inherently dignified, because it shows that side of humanity that makes us unique, reaching towards higher truths and aims beyond the sensory, and us trying to find meaning in our lives. But we don't have to agree on that, I don't expect for us to agree anyway.

I've never heard anybody say that secularism is Islam, that's funny.

What he said. Also, given that many religious people are blatantly seeking or supporting delusions that they think suit them, it's rather laughable to claim that "seeking out truth is, in essence, a religious quality".
No it isn't, because it is a religious quality. Not a quality exclusively for someone who follows a religion, but a quality that drives the formation of religions and culture.