Puwede yon sir.
The employer has the right to choose the employees he will hire.
The Supreme Court said it is the same as the right of the employee to choose which employer he wants to work for. If an employee can be forced to to work for an employer, that is slavery. If an employer can be forced to hire an employee, that is oppression.
But note that this applies only to hiring, not firing.
The employer can refuse to hire INC members. The employer can choose to hire only INC members.
But if the employee has already been hired, the employer cannot fire him simply because he is an INC member. That's illegal dismissal.
If the employee was hired when he was Catholic, then he converted to INC, then he was fired because of the company's policy against hiring INC members, that's still illegal dismissal.
What's the difference between hiring and firing?
During the hiring stage, the issue is the property right of the employer. He has the right to choose his employee.
During the firing stage, the greater issue now is the security of tenure of the employee. He cannot be dismissed without valid ground.