It is normal unfortunately, as my mod is actually a submod of Danova's Last Kingdom mod - and he didn't have any upgradeable buildings etc. Instead he had a religious system in place, and in order to get to recruit good units you needed to have a certain amount of religious conversion in that settlement - it took forever and i hated it so i removed that.
Now, i would have prefered traditional upgradeable buildings and stuff where you get new units when you upgrade your buildings and settlements - but it didn't have such a system implemented. Therefore everyone is recruitable from the start - which is better than needing to convert regions to a certain level of religion in my opinion.