Translation of muslim in German

So we decided to move on. We were looking to get the next flight to Hoi Ann, which is located right in the center of the country, but we were told that there had been floods a week earlier.
I understand that you use the article 'die' when talking about a feminine object, das when the subject is neutral, and der when talking about a masculine object. But how can you remember all these?
In Guatemala this is one of our biggest problems at the moment: young and pore people take drugs and drink alcohol because they are depressed and bored. The capital has become very dangerous.