Why did the pagan Saxons resist baptism in the 8th century, although in the 6th century the same pagan Franks easily accepted baptism?

The Franks of Clovis maintained their independence by being baptized. The Saxons of Vidukinda, being baptized, recognized themselves as vassals of Charlemagne.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.