There are millions and millions of atheists around the world. Whether it's in Brussels or Beijing these atheists cope with deaths in the family in a variety of ways. None of them require the false comfort of god(s) or heaven.
I live in a (relatively) secular society. Most of my friends are nonbelievers. We are at the age where the deaths of friends and family members are not uncommon. In many cases, the memorial services are completely non-religious but even in those cases where the service takes place in a church my friends are not troubled by their lack of belief in god(s).
However, problems arise in societies where the vast majority of people are religious and where the believers have no concept of what it might be like to be an atheist. The problems aren't caused by the inability to cope with death in the absence of god, they are caused by intolerant and insensitive believers who can't, or won't, recognize that their false beliefs provide no comfort to an atheist. That's why there's so much talk these days about how atheists cope with death in the USA [After Tragedy, Nonbelievers Find Other Ways To Cope].
If you read the examples in that article, you will realize that the problems they face would not exist in non-religious societies. Their "problems" all stem from feelings of guilt about not believing or from interfering Christians. You won't see articles like this published in Brussels or Beijing.