The point is that you cannot say you're not challenging the existence of something immediately after you say you don't believe in it because saying you don't believe in it is consequently challenging the very existence of it.
The same cannot be applied to altruism, because how do you define, practise or prove it. Everyone has their own definition of it, varying in magnitude.
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I will surely watch the video.
I am not denying anything simply i do not believe in it. But that does not allow me to challenge it. My initial post meant: In real life, who is going to sacrifice oneself in distressful situation. There is nothing contradictory in there.
A proven definition here:
Agnosticism is of the essence of science, whether ancient or modern. It simply means that a man shall not say he knows or believes that which he has no scientific grounds for professing to know or believe. Consequently, agnosticism puts aside not only the greater part of popular theology, but also the greater part of anti-theology. On the whole, the "bosh" of heterodoxy is more offensive to me than that of orthodoxy, because heterodoxy professes to be guided by reason and science, and orthodoxy does not.
— Thomas Henry Huxley
Agnosticism
Meanwhile definition of altruism on Wiki
Altruism or selflessness is the principle or practice of concern for the welfare of others. It is a traditional virtue in many cultures and a core aspect of various religious traditions and secular worldviews, though the concept of "others" toward whom concern should be directed can vary among cultures and religions.
The line though the concept of "others" toward whom concern should be directed can vary among cultures and religions. is what makes it vague without universal consensus. Who are "others"? Wide interpretation across different cultures is in the article.
People do good things voluntarily and practise as well. So, above things do exist in real life.
Just under certain context. I don't know. Anyways, it was a good discussion.