The answer is NO. And there is nothing to discuss, though one can ramble. The Sikh Rehat Maryada states as follows:
Chapter 1
The Definition of Sikh
Article I
Any human being who faithfully believes in
(i) One Immortal Being,
(ii) Ten Gurus, from Guru Nanak Dev to Guru Gobind Singh,
(iii) The Guru Granth Sahib,
(iv) The utterances and teachings of the ten Gurus and
(v) the baptism bequeathed by the tenth Guru, and who does not owe allegiance to any other religion, is a Sikh.
The thread is closed in order to prevent philosophizing on this point.
Thanks to Ambarsaria ji for his sensitive contribution in explaining the conceptual problems.