Why do highly successful people in computer fields say a degree in Computer Science is not worth to get "JOB"? I'm studying Engineering in India. In Information Technology, Many CS-friends of mine told me that that degree is not worth it and that none of the subjects will be useful in my computer science career.

I subsequently lost interest in studying until a friend filled me in on the uses of each subject included in our course. I started studying hard since I understood the importance/application of these subjects in the computer world. I scored well.

Also, I made projects which were included in course with Interest.

I wonder why people are giving less importance to the Computer Science degree and why they say that it is not important in the real world. I think if it is studied enough, it can definitely yield a job.
My answer follows the answer provided by @DmitrySavostyanov.

I also feel you are basing all your conclusions based on a false assumption and hypothetical facts.

I have done engineering in the same field as yours. I am working in a quite well-known place. And, trust me, all the things that I have studied in my bachelors are coming up every time I start my day. At least the Mathematics and Algorithm aspect of the courses.

Your friends are probably not clear about what are they doing and they are diffusing the same idea into your head. That happens in the engineering studies.

Further, your claim people are giving less importance to CS is baseless. I would stay with my above statements and exaggerate that CS at present is at the apex of anything. However, I do not see partition between CS, Electrical Engineering, Physics. At the end, everything is Science. So, based on that we can say that we must know our fields as much as we can and then think of expanding it further.

If you look at Computational Biology and Computational Fluid Dynamics (and such like), you would see massive use of Computer Science knowledge and mathematics.

TL, DR; Don't listen to such junks from your friends.