To borrow a phrase—to a first approximation, all religions are extinct: Contemporary religious macro-groups are a vanishingly small minority within the greater historical context, and probably ought not be considered the norm for global reach nor demographic breadth of religious dissemination. Some prior discussions relating to this matter:

• When and how did Islam make its way to Southeast Asia? Also why didn't the ethnic Chinese of Southeast Asia convert?

• How did Christianity spread in Ethiopia?

• Why did Sunni Islam spread around the world while Shia and Sufi Islam stay relatively small and contained to the Middle East?

• How did Nestorian Christianity spread to Central Asia and Mongolia? What were the views of the Catholics of the Nestorians?

• Did Islam spread mainly through warfare and conquest?

• How did Christianity go from a small, hated cult to the state religion of the Roman Empire? What made it so different than the hundreds of other small cults throughout the Empire?

In regards to modern religious revivalist movements, a necessary baseline of any further discussion of this topic would be the existence of Hellenism, Rodnovery and Heathenry being measured on the scale of decades rather than millennia.

Further, these particular examples often developed along ethnic, quasi-nationalist, or sometimes explicitly racialist lines in (approximately by demographics for your examples) Greece, Russia and the United States respectively, and would have little expectation of, or motive for, universal dissemination.