What issues do Catholics representing God in fiction historically face? I'm currently running a Role-playing game which is nearing its fourth year of play and  is coming to a close.  The end of the campaign will involve the passing away of this world and the prophesied metaphysical unification of the new earth with aspects of the old heaven, which will then also have passed away.  After a short period of campaign resolution, the game will end, so I don't need to be able to do this for very long, but I will almost certainly have to run direct dialouge with God or, at a minimum, deal with eschatological logistics.  I want to do this is a respectful and sacred way, and I am worried about being up to the task. 

What issues have been brought up by other Roman Catholics in the past as integral to the act of representing God and/or the end times in a fictional work?
Starting off with the Church teaching on images

From the Catechism of the Catholic Church


  CCC 2132 The Christian veneration of images is not contrary
  to the first commandment which proscribes idols. Indeed, "the honor
  rendered to an image passes to its prototype," and "whoever venerates
  an image venerates the person portrayed in it."1 The honor
  paid to sacred images is a "respectful veneration," not the adoration
  due to God alone:
  
  Religious worship is not directed to images in themselves, considered
  as mere things, but under their distinctive aspect as images leading
  us on to God incarnate. The movement toward the image does not
  terminate in it as image, but tends toward that whose image it
  is.2
  
  1. St. Basil, De Spiritu Sancto 18,45:PG 32,149C; Council of
  Nicaea II: DS 601; cf. Council of Trent: DS 1821-1825; Vatican Council
  II: SC 126; LG 67.
  2. St. Thomas Aquinas, STh II-II,81,3 ad 3.


Therefore making of images which Christians may venerate is not contrary to God's commandments, and is in accordance with Church Tradition and practice from the earliest times3.

3. cf. Veneration of Images | New Advent.

In the New Advent articles, we gather that in the first centuries of Christianity, there are no pictures of the Crucifixion except the mock-crucifix scratched by some pagan soldier in the Palatine barracks.

Therefore a picture of the crucifixion can be made to mock in one case and in another for  veneration. Also the article quotes Catholic teaching that "we do not pray to relics or images, for they can neither see nor hear nor help us."

Therefore answering

What issues have been brought up by other Roman Catholics in the past as integral to the act of representing God and/or the end times in a fictional work?

In conclusion, the representation is to be made in a way that is in obedience to God's commandments [the first and the second], in accordance with Church tradition and practice, and also done tastefully and in a way that does not offend not only Catholic, but also Christian sensibility4 as well.

4. cf. Jesus Christ Superstar - an utter blasphemy!!! | The personal blog of Rev Brian McClung, Minister of Newtownabbey Free Presbyterian Church &amp; Administrator of Newtownabbey Independent Christian School.



The Last Judgement, a mighty composition, painted by Michelangelo between 1536 and 1541, in the Sistine Chapel.