I'd not say that Quaid was religous type of person or fundamental by any mean. He was no doubt secular kind of person. But the strange thing about his personality was that he never imposed anything on others as far as personal matters are concerned.
Personaly he was secular, but he took the Muslim ideology as an Ideology of his pupil, and he was the only one to guranatee the success of this ideology. He took it as his job requirement.
I'd like you to study the most authentic and unbiased book on JINNAH's topic JINNAH OF PAKISTAN,(Stanley Wolpert) which shows that even if he would had been a Hindu by belief, still when he owned the responsibility of protecting Muslims' rights in subcontinent, then it means he would sincerly do that, better than any Muslim could have done. He was realy man of his words n Principles. Only Iqbal was his other replica in mental capabilities and sincerity.