when they are told to spend for the cause of god out of what he has provided for them for their sustenance the disbelievers say to the believers should we feed those whom god has decided to feed? you are in plain error.
وإذا قيل لهم أنفقوا مما رزقكم الله قال الذين كفروا للذين آمنوا أنطعم من لو يشاء الله أطعمه إن أنتم إلا في ضلال مبين