If the university from where I have done my graduation is declared as fake, would that affect my professional career?

Yes, it would affect your professional image and that would also lead to that they will ask you to leave the job and also a strict action would be taken by the government and you would be nullified further to apply for any type of job.

Yes, it would be illegal to lie about or forge a document like this- mainly where applying for work is concerned. However I can guess why one would ask this question and I have never heard of any job, anywhere, checking with a high school to see if you actually graduated. It wouldn't even be an issu