Which article tells who is required to support and obey the constitution?

The answer to this question is Article (VI) 6
The people that is required includes all members of the government and all civilizans in all states.
The articles also stated that the united states shall not give any form of religious qualification for the people who wants to become public officials

Article VI holds this requirement. This requires that all judges and justices, along with those elected to the representative bodies of Congress, are to be bound by oath, without the imposition of a religious test as a qualification for holding such a position.