Near as we can tell, evolution is so true that it actually has a higher certitude than a lot of other ideas that people accept as unquestionable in day-to-day reality.
There are many unanswered questions about the nature of biological change over time. But we understand so much about evolution, from its mechanisms (DNA and RNA) to how it tends to operate to its general time frame, and the evidence for it ties together so many disciplines, that for it to be falsified or even put into any serious doubt would require a mountain of evidence.