First off, I'm not "proud" to be an atheist. I'm simply another human animal muddling their way through a complex world... just like a Theist who pretends to know so much more. In that respect, "pride" has nothing to do with it.
Why do you think atheism is your best choice ?
My position is an extension of the rule, "To thine own self, be true". I have had many amazing experiences in this short life and could easily attribute those experience to "god", however, not being an expert on "god", I'm in no position to claim that my experience were really "of god" or not. I'm not so arrogant as to allow myself to boldly claim that what I see IS god. I don't really know what "it" is. The thing is, due to my ongoing inner experiences, I have a high level of certainty that others don't really know either.
Do you think that your life is limited and there is no afterlife?
I do not believe in an "afterlife" as it is generally conceived, No. I do not believe in "death" per se, either. I see life as changes.
What if your body died and you found out that you are still alive as spirit and you realize that your test on earth have been finished,will you feel sorrow,anxious and fear.
Been there, done that, minus the test thingy. Actually the feeling was one of triumphant exhalation. Sorrow, anxiety and fear never entered my mind. Go figure. This life isn't a test, rather,
it is a bit of a "what if"
experiment. (Don't worry, you will understand what I mean one day.)
Do you always say that you still have time that you may look after religion when you are old but not now.
Given that I am already 56, there is virtually no possibility that I would ever take any religion of the human animal seriously enough to consider adopting it. I've already made the rounds, more so than most, and I always found them wanting. "They all have their crumbs, but their loaves have long since turned to dust." Personally, I prefer my reality, plain and unvarnished. It's so much more entertaining not know, for sure, what lay around the next corner.
if you want to think about a religion,which one you think you may choose.
I would never seriously consider ANY religion. I can tell you, quite plainly, and with great honesty, that Islam would be my very last choice, however.
What are the benefits from atheism on earth
Atheism allow the individual the freedom to see reality how it is; by not pretending how reality SHOULD BE. I don't see a downside to this, though some fragile ego's may get a bit roughed up over the thought.
Are you sure 100% that there is no god,which makes you happy to choose atheism without any worries for what will be afterlife.-
Of course not. You see, if indeed Allah created me, and he is really All Wise, All merciful, etc, ad nauseam, I rather expect he would understand me fairly well. In theory, he would know precisely why I chose what I did and just smile and welcome me. I have no unnatural guilt on this subject. Sorry to burst the bubble.