True, but it is a common statement among evangelicals.
They have come up with a totally incorrect definition of "religion."
On this forum and elsewhere, I have brought up the verse in James where it talks about "pure and undefiled religion," and they claim that what James says is NOT "religion."
It's good to be aware what tens of millions of those outside of our faith think of the word 'religion' to mean.
Today, in America, the common parlance, usage, for religion is something like this, as best I can tell:
Religion (modern American usage):
1. Any belief system involving doctrines and believers that believe in those doctrines, who hold those beliefs as central in their lives. Anything can then become a 'religion'.
Examples: Buddhism, Capitalism, Secular Humanism, Christianity, Football, Harry Potter, etc.
The key being that the person truly makes this system and its rules and principles their primary focus and emotional home.
2. Any belief system about transcendent things, a 'higher power' or hidden order that pervades the Earth and Universe.
Examples: Christianity, Islam, Transcendental Meditation, The Tao, etc.
3. More narrow meanings...
So, while you and I are fine to call a religion something else, like any organized belief in the one, true God, or perhaps a wider definition, the above though are the most common usage in actual use in ordinary American conversations among diverse groups of Americans. It's good to know so that we don't end up saying to them Christianity is only like Harry Potter. I like to quote occasionally (not every week though) in more diverse groups:
James 1:27 Pure and undefiled religion before our God and Father is this: to care for orphans and widows in their distress, and to keep oneself from being polluted by the world.
We can accurately paraphrase it, keeping exactly what it means I think like so:
"Religion that God the Father accepts is to care for orphans and widows, the poor, sick, those in distress, the oppressed
[*], and to keep oneself from the mistakes and wrongs of the world like greed, prejudices, hatreds."
(* - each of these are from scriptures)