What I meant to ask is that nowadays, when most of the commandments are not being observed, and we are left with tefillin and the Sabbath, it's hard to see an essential difference between the religious person and the secular person. They're both moral people, both want to do good in the world; the only difference is that the religious person puts on tefillin in the morning.
To sharpen the point: I don't mean to ask what the purpose of the commandments is, but rather what the big deal really is here if in the end there is no noticeable and essential difference.

To my amazement, it seems you actually did mean to ask seriously after all. Are you sure you devoted the necessary half minute before you elaborated? I have to say, I don't know which of the two possible answers would be more flattering to you.
Beyond the Sabbath and tefillin, there is prayer, blessings, tzitzit, eating kosher, family purity, holidays, Torah study, the prohibition on homosexuality, and much more. And of course there is religious consciousness itself (and the experience, for whoever has it) and commitment to the commandments. There is belief in the Holy One, blessed be He, each person in his own way, and gender separation in Dizengoff Square on Simchat Torah hakafot and on Yom Kippur.
And beyond all that, why does there need to be an essential difference between a religious person and a secular person at all? Suppose there isn't one. So what?
In short, a bizarre discussion.

So then why did God come down on Mount Sinai?
How do you persuade a secular person to switch sides if it's not really such a different side?
And all the details you mentioned are kind of marginal in day-to-day life too, except maybe homosexuality…