Some foreigners in Afghanistan celebrate Christmas in churches on military bases or embassies; and Christians who live in the country celebrate quietly to avoid persecution. Most people in Afghanistan don't celebrate Christmas because they're Muslim, and it is not a national holiday.
Visitors to Afghanistan decorate artificial Christmas trees, eat Christmas dinner, talk to distant family members and participate in other familiar traditions. People who live in Afghanistan might decide to go to work or stay home to avoid attacks that are more likely to happen to Christians near Christmas. They would avoid decorations because they could attract violent people. Many Christians have already left Afghanistan because of the dangerous situation that exists there.