A couple of notes:
+Instead of random holidays that are not properly spaced there are four week long holidays. They roughly correspond to the major Jewish holidays and all end at an equinox or solstice (which provides a good measure of non arbitrariness). Christianity could then use them as celebration points throughout the year.
Spring Holiday= Celebration Holiday
Celebration of the Resurrection
Summer Holiday= Petition Holiday
Celebration of Grace
Jewish Shavot (Feasts of Weeks)
Fall Holiday= Gratitude Holiday
Celebration of Provision
Jewish Sukkot (Feast of Booths)
Winter Holiday= Repentance Holiday
Celebration of Justice
Jewish Yom Kippur
+With this calendar I am proposing a six day work week with shorter work hours on each of the days. (or you can just not have the week long holidays and make every 3rd month have an extra week)
7 hrs a day @ 6 days a week @ 48 weeks a year = 2016 work hours
8 hrs a day @ 5 days a week @ 52 weeks a year = 2080 work hours
+Each month has the same number of days, being 28. This means that every individual day of the month is always a certain day (ex: every 5th of every month is a Thursday). It also makes each month more in line with the lunar phases.
+Due to dividing the year into equal weeks, there is one day left to account for. I would put it right at the end of Spring holiday and call it something cool (celebration day will have to do for the moment). It would not be a day of the week. And to come full circle, it would be the start of the new year. The resurrection of Christ being the resurrection of the year.
+Just so you know I know: I don’t ever think a new calendar system will be implemented. This was just an exercise in the ideal. And think of all the people who have birthdays on days 29 to 31 who would be offended.