If the JW's can receive new light, why can't the Catholics or any other religion also receive new light, that would bring them a little bit closer to the truth.
So, if JW's can have new light, why do they call the other religions false? Aren't they also entitled to receive new light somewhere down the line and maybe become even closer to the truth than the JW's are.
As long as a religion can constantly recieve new light, so can others, which means there is no false religion, just religions changing slowly from one belief to another either very slowly, or a little faster.