God & Divination Question

Yes and no based on religious/spiritual views and UPG.

In conjure work, I see more a focus on ancestor divination, or other Saints, Prophets, or non-Christian spirits (Big Momma and Black Hawk for example).

This is largely based on the religion of the conjure worker. A strict protestant, such as Pentecostal, conjure worker probably wouldn't call on a Saint for help. Depending on the branch, they also would not use the trinity in conjure work.

When I see people who practice "Christian witchcraft", they often do not do divination for the future, just reading the spirit of a person or event.

There is nothing wrong with asking God for the interpretation of a spread, dream, omen, or anything. Daniel, who is petitioned for help in divination, often asked God for help. He actually has a pretty awesome prayer to use after divination:

Daniel 2:20-23

20 Daniel answered and said, Blessed be the name of God for ever and ever: for wisdom and might are his:

21 And he changeth the times and the seasons: he removeth kings, and setteth up kings: he giveth wisdom unto the wise, and knowledge to them that know understanding:

22 He revealeth the deep and secret things: he knoweth what is in the darkness, and the light dwelleth with him.

23 I thank thee, and praise thee, O thou God of my fathers, who hast given me wisdom and might, and hast made known unto me now what we desired of thee: for thou hast now made known unto us the king's matter.