While the Julian calendar was clearly more secular, The motivation for the adjustments in the Gregorian calendar was to re-align Easter to a historically accurate date and to ensure that people around the world were celebrating it at the same time. While you are definitely right that the Gregorian calendar stems from Roman culture, one cannot deny that its revisions were religiously motivated and funded. Further, that its history and global adoption is intertwined with the spread of Christianity around the world. With its global adoption cultures all around the world have lost their connection to their own calendars and practices.
And keeping track of calendars was part of their job!!
>The Pontifices were in charge of the Roman calendar and determined when intercalary months needed to be added to synchronize the calendar to the seasons. Since the Pontifices were often politicians, and because a Roman magistrate's term of office corresponded with a calendar year, this power was prone to abuse: a Pontifex could lengthen a year in which he or one of his political allies was in office, or refuse to lengthen one in which his opponents were in power. A Pontifex with other political responsibilities, especially away from Rome, might also have been simply distracted from his calendrical duties as chief priest. This caused the calendar to become out of step with the seasons; for example, Caesar's crossing of the Rubicon in January 49 BC actually took place in mid-autumn.
Under his authority as pontifex maximus, Julius Caesar introduced the calendar reform that created the Julian calendar, with a fault of less than a day per century, and which remained the standard till the Gregorian reform in the 16th century.
https://en.wikipedia.org/wiki/Pontifex_maximus#Roman_Republi...
i.e.: the death of an ethnic Jew
> Christian fundamentalism as a excuse to colonize people all over the world and commit atrocities.
Monotheistic belief systems are not tolerant of people that believe in other deities.
This "fundamentalism" can be found in every monotheistic belief system, especially as you start going back in history.
History is full of examples of Christian kingdom/empires/countries waging war against each other.
World history of full of conflicts in single every region of the world, including regions with negligible Christian presence.
> however, unlike most religions proselytizing is a feature (not a bug) of Christianity
D'varim 13, 7-10