Wouldn't change things much probably. The code doesn't seem to have been particularly enforced.
Which isn't necessarilly a good thing. The edict authorized slavery officially but it was already being practiced before that. Furthermore, there are parts of the Code Noir that were actually aimed at better regulation and better treatment of slaves. For examples, while the code authorized corporal punishment to punish fugitive slaves, there were also provisions that were basically asking masters to treat their slave well if they didn't want a fine or to see their slaves confiscated from them.
Jonathan said:
It not only permitted slavery but also put heavy restricted the activities of free Negroes
I think you are wrong there. I had a quick look at the Code Noir and I don't see anything specifically restricting activities of free slaves.
Furthermore, you have article 57, 58 and 59 of the Code. Article 57 consider free slaves to be French subject, while article 58 and 59 indicates they fall under the same rights as French Colonial Subjects. Seems to me more like a will to declare free slaves as equals as French Subjects.
That said, I'm not an expert on the Code Noir so I might have missed something.
Jonathan said:
Without the Code Noir, we may have seen a higher number of African slaves, practising their own native religion rather then being forced to forget them and to accept the preachings of Catholicism.
It's also possible that a greater number of slaves would be practicing syncretic religions like Vodoo.