Total support for the Revolution was about forty or forty-five percent. It was never a majority. Fifteen or twenty percent were loyalists or “Tories.” Thirty-five to forty-five percent were basically uninvolved, either due to philosophical pacifism or political apathy.
The Revolution didn't happen because the majority of Americans flocked to Washington's standard. Even among the forty or forty-five percent who actively supported the Revolution, only a minority actually fought.
The Revolution happened because a tiny handful of committed Americans, faced with a situation they were unwilling to tolerate, decided to risk everything to fight against it. A much larger percentage, but never a majority, provided support in varying degrees to the few who fought.
That's always the way of it. Those who struggle for major changes in society are almost never in the majority, and often they find themselves facing terrible odds. Every once in a while, they get a win. And then, just like the millions of French people who tried to claim membership in the French Resistance when the war was over even though the organization had never had more than two hundred thousand members when it really mattered, the story gets whitewashed. A lonely struggle by a handful of outsiders gets described and then taught as a unanimous mass movement.