How should I answer this college essay prompt?

How should I answer this college essay prompt?
The prompt is:

Describe an experience of cultural difference or insensitivity you have had or observed. What did you learn from it?

I already started my essay it’s about how this boy in my class once told me that he was atheist and started making fun of Christians. Which caused me to question why/if I believed in God. Do you think my example fits the prompt because I read some other people’s example online and it was more about traveling to another country and learning about the culture and how it conflicted/compared to their own.

Along with that the college gives me this advice: You may define culture broadly. For example, it may include ethnicity, customs, values, and ideas, all of which contribute to experiences that students can share with others in college. As you reply to this question, reflect on what you have learned — about yourself and society — from an experience of cultural difference.

I think you’re going to want to be very, very careful in how you approach this topic. Remember that unless you’re applying to a school with a strong religious affiliation, you have no way of knowing whether the people reading your essay are Christian or atheist or something else entirely – and if you turn the boy who spurred this crisis of conscience for you into a strawman, you run the risk of offending someone and making them worry that you aren’t good at viewing things from others’ perspectives. Doesn’t mean it can’t be done, but it’s going to require a lot of sensitivity and careful thought. If you don’t think you’re capable of that, you may want to find another way to define culture.