The exact date of the last common ancestor humans and chimps had is in question but the fact that we had on is not. Our understanding of the sun and how it works changes with time but we no it exist. The evidence that stars are really distant suns is really no stronger than the evidence that species changed and evolved over time or that the started with simple and moved to more complex. If you want to believe evolution was guided by god there is no way to prove a negative but don't doubt it happened.