Is separation of church and state prescribed by the United States Consitution or not?
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof...
That depends how you define "separation of church and state". If you mean public funds can't be used to advocate particular religious beliefs, then yes. If you mean that people aren't allowed to advocate their own religious beliefs in a public forum, then the principle goes blatantly against what the Constitution says. Both halves of the clause need to be respected.
Is separation of church and state prescribed by the United States Consitution or not?
Yes. 'Separation' is in effect directed [prescribed] in three different places. --
States are directed to have republican forms of governments, [no theocracies allowed].
- No religious tests for office are to be allowed.
Nor are laws to be made that respect any of the establishments [teachings/precepts] of religion.
Too bad that so many people simply can't accept these simple principles inherent in our Constitution. -- Freedom of religion, & and freedom from religion are of equal concern.