Very few followers go with his truthfulness more than with his falsehood; because most people follow falsehood creeds.What?! Are you really trying to argue that having very few followers confirms the truth of what he says?
For this reason, particularly at the start, the followers of every prophet are few.
In addition, take the Christ as an outstanding example: when he was among people, they denied him, because they saw he was human like them, and they doubted because of their wrongdoing with varying degrees of doubt.
But later Christianity spread when his followers [while they wanted to convince people] started to display him as extraordinary and superior to humans, especially about his miracles, and people started to spread lies and enthusiasm about him, and in this way, I think, Christianity spread.
So with real truth, people deny, but with lies and enthusiasm, they believe.
For this reason, Prophet Mohammed invited people with logic and arguments, not with miracles, with the exception of the Quran as the miracle... because if God gives him some objective miracles, either they will deny his miracles and say it is magic or they consider him as son of God.