Challengers, seeking to have the law suspended, have said the fight is not over.

The ads allude to 21 reasons to consider a move to Manitoba -- a play on Quebec's Bill 21 before it became law.

A student studying to become a teacher and the English Montreal School Board are among those who have also filed lawsuits.

Protesters at the rally argued that the law that dictates what new teachers can wear mostly targets Muslim women, and some feel the bill has created an unsafe Islamophobic environment inside and outside the classroom.

Bill 21 prohibits public-sector employees in positions of authority — including teachers, police officers and judges — from wearing religious symbols while at work.

Teachers who don't follow the secularism rules come Sept. 3 could potentially face sanctions.

Advocates say federal leaders should have spoken out directly after Sunday night's passing of the controversial bill, but they did not.

Bill 21, a controversial legislation that makes it illegal for public sector employees to work while wearing religious symbols, was passed Sunday night.

Simon Jolin-Barrette insisted Sunday that Bill 21 does not withdraw civil rights. The government's religious symbols ban would bar public employees in positions of authority from wearing symbols in the workplace.

With less than two weeks left in the spring session, the Liberal Opposition says Simon Jolin-Barrette's juggling act is hindering important debate at the National Assembly.