Question

Please can you tell me if this merge is valid?

Answer 1

The tree you can put together from these two articles says the two Christophers are the same person

https://en.wikisource.org/wiki/Ridley,_Lancelot_(DNB00)

https://en.wikisource.org/wiki/Ridley,_Nicholas_(DNB00)

The martyr's uncle John was Lancelot's father.

Answer 2

Find some sources and the uncertainty will get less. Here is a Nicholas Ridley on wikipedia:

https://en.wikipedia.org/wiki/Nicholas_Ridley_(martyr)

Answer 3

There is no merge proposed for that person.  Sources are harder to find in the 1500s, but you need sources to determine if a merge should be done, so you can compare sources and all information about them.