So if someone was still talked about a long time after their death and their followers are willing to die for them, you think it's true? Are you also a Muslim?
Because the Roman Empire heavily ingrained Christianity in Europe for
centuries,From Spain to Greece to Russia and England.Then when these
Roman provinces gained independence(France,Spain,Portugal and Britain),
they started invading the world and ingrain these Religions to other peoples too
and even stole/settled other lands and influenced other peoples too like for example
(South Americans,Africans,Filipinos,Australians) etc. It is hard to erase 2 Millenia of
cultural influence and Imperialism.
Old books. You ever heard of Circe or Cyclops? From Homer's Odyssey? Written long before the Bible was cobbled together. A lot more fun to read, too. A woman that can turn men into pigs and a one-eyed giant. People will talk about any old stuff. Most things worth talking about, aren't. Not here, anyway.
If Muhammad wasn't the prophet, why do people still talk about him 2000 years later? If Zeus wasn't real, why do we still talk about him 1000's of years later? Nice logic.
The Crucifixion of Jesus is clearly noted in ancient Roman scrolls of the time along with the elaborate Syriac Manuscript.
In the event an individual has trouble or doubt in believing the above they are totally lost, documented truth from various sources of the particular time period have great validity.