Do Major Sins Make A Person Disbeliever
The magntiude of the sin does not matter. It is what it symbolizes. If a person only sins, then he may be forgiven and punished accordingly. But if he is sinning with the intention of intentionally rebelling against Allah. Then there will be an advising stage, a warning stage and then a grace period for repentance. All of these stages Allah will take such a person through before labelling him off as a kafir. That’s why deciding whether doing x and y will make someone a kafir is not something to worry about. It’s not something you can fall into so easily. Allah is merciful and forgiving, He will try to stop a person from committing kufr and even after a person becomes a kafir, there will be a time period of advising/warning and final time to repent before He judges him.