Learn French: Nous analysons une caractéristique culturelle, telle que la religion. - We analyze a cultural characteristic, such as religion.

The phrase tel que (meaning such as) must agree in gender and number with the noun it gives an example for. Since it refers back to une caractéristique (a feminine singular noun), it takes the feminine singular form telle que.

Wait, does telle que agree with the noun before it or the noun after it?

It agrees with the category noun before it, not the specific example after it. Here, it agrees with caractéristique, not religion. Even if the example were a masculine noun, like le sport, it would still be telle que le sport because it is giving an example of the feminine caractéristique.

Could I just use comme to say such as?

Yes, you can absolutely use comme here. Saying comme la religion means exactly the same thing and is very common in everyday spoken French, while telle que sounds a bit more formal and written.

Why do we say la religion instead of just religion after telle que?

In French, abstract nouns and broad concepts almost always require a definite article (le, la, or les). So when talking about religion in general, you must say la religion, whereas English just says religion.