Many atheists ask the question of how an afterlife is supposed to make this life any more valuable and how just the idea of living on in an afterlife of eternal joy is supposed to make your life more happy and make you more motivated. I will tell you how. If someone came up to you and told you that you are going to go on some amazing vacation to some other part of the world in which you are free from your problems and are able to live a happy life there, then it would be very likely that you would feel very happy and motivated. You would be very happy and motivated in this life and would excitedly do things in preparation to go to that part of the world. As a matter of fact, that happiness, motivation, and excitement would be very likely to motivate and encourage you to do more of the things that you normally do in your daily life and would encourage and motivate you to strive towards those said things even more. For example, if you had a career in life such as being a composer, then you might be motivated and encouraged to pursue that said dream even more in the meantime before going to that vacation since just you knowing that you will go on that amazing vacation has encouraged and motivated you to do more of the things you like to do. Especially if I told you that the only way you can go on that vacation is if you made the best of life in the meantime and that if you do wrong deeds, then you would not go to that vacation (just like how some religious people would be more encouraged to make the best of this life if they were told that they would go to heaven only providing that they made the best of this life in the meantime).

But if someone then came up to you and told you the truth which is that there is no such vacation and that you are just going to have to live with and deal with your life of problems, then it would be likely that you would feel discouraged and would do less of the things you like to do in life. Or, at least, you would do these things less intensively than you did before when you did believe that you were going to go on that vacation. However, even though over time you might develop a sense of acceptance towards your life of problems and that feeling of discouragement might disappear, it would be irrational for you to develop a sense of greater motivation, happiness, and value towards this life rather than having the greater value through believing that you would go on that vacation. The only way it would be rational is if there was something bad and/or horrible that could happen living a blissful life. But in the event that such bad/horrendous events would never happen and/or that they should not happen, then if that person then somehow came back up to you and told you that you actually will go on that vacation despite your values towards living this life you have instead, then you might say to that person "Who needs that dumb vacation when I have this amazing life to live?"

However, that mindset is irrational. It would be no different than if you were in some hospital bed with cancer. Even though you might very well have developed a sense of immense value in life despite your cancer, it would be irrational if someone came up to you, told you that there is a cure for cancer in which you would be able to live a happy life free of such suffering, and then for you to refuse to be cured of that cancer and for you to want to remain in that hospital bed. This is because we are evolved to be reward-seeking animals. The greater sense of reward comes not only from us developing a sense of immense value towards this life despite all its suffering and also in living for others, but also when this said sense of reward is combined with another sense of reward which would be living a happy life of very little suffering.

So in my example with that vacation, then knowing that you would go on that vacation combined with the value you have towards your life of suffering should combine to create the greatest sense of value in your life. Even if it is a life in which you have the greater sense of value living for others rather than yourself, you should still have the greater sense of value in life if that said life also had happiness and very little suffering offered to you. We are of just as much value to ourselves as we are to each other and we have every right to have value/live for ourselves as much as we would for others. We have every right to do this as long as we are not harming/demeaning those innocent good people. Therefore, the rational thing for this cancer patient to say to that person in return would be something like "Even though I have developed a sense of immense value despite all my suffering in this hospital bed and I have used that life to make others happy, a life in which I am personally free of this suffering would be the greatest life for me as well. I can also use that life free of cancer to do even more and greater things in this life than I ever did before. Even if you are somehow lying to me and that there really is no cure, then just me believing that I would be cured of this cancer one day makes my life even more valuable and makes my life that much more worth living for."

So as you can see here, it would be irrational of atheists to not have value towards an afterlife of eternal joy in which they are free of their problems and suffering and for them to actually find no value in living such a life if such a life did exist. It would be irrational of them to have no value towards believing in such an afterlife even though such a life does not exist. Therefore, religious people are not the only ones with irrational mindsets here. Some atheists might have less value or no value towards the idea of an afterlife of eternal joy. Maybe it is because such a life does not exist or it could be that they feel that they would not be able to do the great things in life that they wanted to do if they lived such a boring blissful life. First off, just because something doesn't exist doesn't mean that it doesn't matter. To say that it doesn't matter would be no different than saying that anime (Japanese cartoons) or videogames do not matter and should not be watched/played and that people should have no value towards those said things simply because they depict worlds and characters that do not exist in reality. Even our own perceptions of reality do not exist. What I mean by that is that everything we see in this life is not what it actually is when we look at it all from a quantum level. And yet, people still find value towards those said things in life anyway. They find value in the perception of those things despite that perception not actually existing in reality. So, in other words, we value our ideals of reality which would be our ideal perceptions of reality that actually do not exist in reality.

Second, if there was such a blissful life in which you would always be innocent and you would never do harm to anyone else despite such a life not having any suffering, then you can still do great things in that life anyway even better than you could before and you could easily find a greater sense of value in that life. It's just as with my example with the vacation and the cancer patient. Even though such lives free of problems are blissful, you could easily find greater value in such a life and should be encouraged to do more great things in that life. For example, with a vacation, you could actually go and live there and choose to pursue your dreams and such there anyway despite the fact that such a life is blissful. As a matter of fact, you should be more encouraged to pursue your dreams and such even more intensively than you did before when you did live a life of major problems. Same thing with the cancer patient in that he/she should find the greater sense of value living a life free of his/her cancer. Otherwise, his/her life will have less value if he/she was not free of that cancer and/or did not believe that he/she would be free of it one day. Also, there is no need whatsoever to be bored and/or go insane from such a blissful life based on everything I've said here. You couldn't go bored and/or insane anyway since being bored and/or going insane is a form of suffering. Since there would be no suffering in that blissful life, then you should never go bored, insane, and/or find less value in that life.