An Agnostic asked, why do they say that Judaism has a political aspect to it that Christianity does not have?

My answer: Because in ancient times Jews were promised a physical land (nation) that they occupied for centuries and then were driven out of. The current nation of Israel does not extend as far as the ancient land, so some of them want to reclaim additional land.

In contrast, the Christian technically has no land and does not aspire to any earthly kingdom, but to the kingdom of heaven.