Roman influence in Northern Europe without Christianity

POD: Neither Christianity nor a Christianity analogue emerges in the Roman empire. Of course there will be mystery cults and such, but none of them receive patronage as the official imperial religion, or if they do they lack the missionary zeal that led to Christianity's spread into Northern Europe IOTL. Also, the Western Roman empire still collapses under similar circumstances to OTL.

This is a pretty huge POD obviously, but I want to focus on how it affects the cultural development of Northern Europe. Christianity served as a vector for the transmission of parts of the Roman cultural package into Northern Europe- the most obvious example being the Latin script. Following this, Western Europeans shared a common religion under a unified(well, some of the time) Church, a common script, a shared Latin-centric high culture, and some degree of cross-cultural standardization.

OTOH you might say that this resulted as much or more from geography as from Christianity. Given Northern Europeans had a much lower population density then the Mediterranean region, and were cut off from other high-density civilizations, it may have been inevitable for them to adopt aspects of Roman culture. But perhaps less could have been adopted? For example, without missionaries serving as vectors for the spread of Latin script perhaps it's more likely that the that Germanic peoples would have retained the Runic Alphabet?
 
I suspect that runic scripts would persist in Scandinavia and possibly in Germany, but they're unlikely to penetrate Britain or Gaul for anything other than ritual purposes, because there are just too many people who are literate in Latin, even without Christianity. If a Frankish empire still emerges in Gaul, and conquers into Germany, it may well carry parts of the Roman cultural package with them. In Eastern Europe, without Catholic missionaries, you may see Slavic languages written in runic-based scripts in the north, latin-based scripts in regions bordering latin-alphabet users, and Greek-based scripts in the East and Balkans. But what is likely is a wide profusion of scripts, similar to what one finds in India.
Absent Christianity, Koine Greek is likely to be the lingua franca of the Mediterranean world, potentially spreading to form a general scientific/literary/diplomatic lingua franca, similar to how Sanskrit was used across India and pre-Islamic South East Asia, or Classical Chinese was used in North-East Asia.
Ogham is likely to standardise as the script for Irish, possibly spreading to Scotland with the Gaelic language, which would create a distinct visual contrast between Brythonic and Goidelic languages. Englisc may or may not continue using futharc, potentially on a regional basis, adopting latin script in areas with many Romano-Britons and only retaining futharc for ritual use.
Religiously, there's likely to be a lot of syncretism and interpretatio romana/germana.
 
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