I was talking about destruction of the soul.
That's for people willing to believe in such things to worry about. The immortal soul is a nefarious idea in the hands of Abrahamic religions. It is used to make you a hostage to an ideology, as there is no escaping punishment from the afterlife that it is claimed this soul will be sent to.
"To the philosophy of atheism belongs the credit of robbing death of its horror and its terror. It brought about the abolition of Hell." - Joseph Lewis
Those who place bets on the life of this world, miss out on the spiritual journey and in the next world
I'd say it's the other way around. As far as we know, there is no next world or spirits. An authentic spiritual journey can be had while alive, and it involves experiencing a connection to nature, which is associated with a warm feeling of belonging in the world associated with a sense of awe, wonder, gratitude, and mystery. What these religions have done is extracted the sacred from nature and displaced it to a ghost that neither respects man or nature, and which issues threats and commands from outside of nature. To me, that's a spiritual zero, and they do you a disservice redirecting your attention from here and now to there and then when there is no reason to believe that there will be a there or then for us.
Now read your words again in the light of that perspective. Who's missing out on the spiritual journey? I'd say it's the person who views life as a staging ground and lives it like he's waiting at a bus stop to be taken away to something better. Do you really enjoy being alive? Do you think you've made wise choices even if the god and afterlife you believe in don't exist?
Happiness for me is something of the next world, the injustice too great in this world to just be a happy person. Grief is more noble then apathy in this scenario.
Prolonging grief is not noble. In my opinion, your religious beliefs explain why you are unhappy where I am not, and why you call acceptance apathy. You've probably seen the aphorism about acceptance - the "wisdom to know the difference" stuff. I find no value actively and indefinitely grieving what's not in my power to help, but it does degrade life.
to a believer, you have to take side of the truthful
Your definition of truth is not the same as mine. Faith is never a path to truth as I use the word. One has to demonstrate the truth of an idea to call it knowledge or truth. Fervent unfalsifiable belief is not truth to me.
Quran also talks about disbelievers being a helper against God.
And critical thinkers often feel the same about holy books being an enemy to an authentic, spiritual existence - a "helper against" reason and happiness. Look at how different the two of us are. You seem agitated by life and its injustices, and focus on getting out of it in the favor of a god for a promised reward which promise need not be kept.
You would probably love for me to "wake up before it's too late." I wish the same for you, but I don't believe that's possible, just as my returning to theism is probably not possible. I tunneled out about four decades ago when I was more adaptable. It was only possible because I hadn't forsaken critical though and evaluating evidence, so, when the evidence that the religion was false became apparent, I recognized that and had an incentive to leave it, but it was very difficult. For about a year, I found myself praying to a god I no longer believed in: "Jesus, if you're really there, give me a sign." It was like quitting cigarettes. The addiction took a long time to dissipate to where it no longer nagged at me.