Further to the above....if we really want to find out about secular spirituality we only need to ask few questions...
1. Do you think life is not merely an accident but is meant to be? Yes/No
2. Do you believe in a purpose to your individual live? Yes/No
4. Do you believe in life continuing after death in some form? Yes/No
4. Do you believe your life is guided by some unseen force and is not entirely in your conscious control? Yes/No
This should be enough to establish how many people accept secular spirituality without necessarily bringing in God, mythology and religious concepts.
There is no evidence that I that know of which suggests that life was meant to be, I consider that we all make our own purposes in our individual lives, I have no reason to think that individual lives continue after their deaths and, again, there is no evidence that unseen forces guide our lives, unless, of course, you consider that evolutionary tendencies, and our physical make-up have a large part to play in how our lives progress.
However, I insist that I am still able to use the term secular spirituality if I so wish with regards to myself, whether you agree with me or not, simply because such a term has no exactitude, can emphasise different things to different people and is in no way defined by you at all, and certainly not by your seemingly loaded questions.