Yep, belief can be a great source of comfort /hope and sometimes, when your heart is in your boots because of life events, they are two great things to have/hold on to.
I won't go into detail here but I know this from my own life experiences. Stuff happened to me and I have never wanted to believe so much in my entire life in the concept of an afterlife, where loved ones are reuntied. My logical atheist brain fought against the comfort that belief would give to assist me during those times and my thinking/emotional life went into a flux that wasn't at all pleasant. Had I have been a life long believer, I honestly think those dark days would not have been so dark nor the future so starkly cold but logical.
If a friend came to me to say they didn't believe I would consider it a kind of duty to try to prepare them/make them aware for/of the stark reality that none belief can bring if life decides to deal them a body blow.
Another example
My friends dad passed away recently. He was a lifelong atheist who had adored his wife who had sadly passed 5 years previously. Just before his death, him being terminally ill, he decided to become a member of the Catholic church. He sought and accepted a conversion. His son, my friend, also a convinced atheist, couldn't believe the change and, having been highly influenced by his dad, whose positions and words he hung on and adopted as his own, seen it as a betrayal of their entire relationship.
He contacted me to go for a walk to discuss this , in a bid to make sense of it ands to get the bitter taste this alleged betrayal had left him with understood, if that were possible. I told him I thought that I believed his dad was still an atheist in reality but, because of his undying love for his wife, had decided to edge his bets in a bid, a desperate bid the truth be told, for the chance of being reunited with her. I will wager that wishing to have belief for the last 5 years he had outlived his wife for had crossed his mind on many, many occasions
The moral of these stories for me is that the rejection of belief and all that it offers as a coping/comforting measure comes at a huge price when it comes to the loss of loved ones and the distress, lifelong distress, that causes.