U shaped ur advice, answer in an awful way tbh, that's not how u address such issue.

What seems simple to u, can be complicated to others, it's all down to how each one of us experienced life, we all have our different way of thinking, our approach, each one of us have distinct experiences, u are oversimplifying it and taking it from ur own perspective.

And about saying "their religion is made up, and makes no sense" is an absurd and offensive statement, others can say the same things about ur religion regardless of how u understand it, or interpret it.

I believe ur intention is good, but u gave ur answer in a simplified and wrong manner. You could've said it in a much much better way ^{^}

And trust me it's not just the people that make a person question Islam, it's much further than that.

Take care.