Countries that speak a different language to the religion they are aligned with flag

[Spongebob]

First of all, the New Testament was originally written in Koine Greek, not Hebrew. Later translations were Latin and not until much later English.

Also, flags represent countries and don't necessarily reflect the country's religion. They can, but they don't have to. Certainly many don't suggest any religious affiliation.

Language is also divorced from religion in that religious ideas can be translated into any language. Language is strongly cultural and people are reluctant to lose cultural ties.

And lastly, for religiously diverse countries, as England is, why would language or their flag be consistent with any one religion since there is an accepted diversity of religion. Yes, England has an official religion, but in most ways that is little more than ceremonial now.