There will only be 538 people voting for President.
There will be millions of people voting for president. There will be 538 electors voting. Is that what you meant?
The Electors are functionaries and you know it. In reality, the People of the States and D.C. elect the President and Vice President, which each State worth varying numbers of points and D.C. worth 3. So the Electoral College is not analogous to the parties' delegates.