The Fourth Man "De Vierde Man"

What is the relation of a spider crawling over a crucified sculpture to the movie "The Fourth Man?"
                The moment I have watched this film, I didn't really focus on the spider that was shown in the film. I just thought "oh it must just be an extra," until I understand what the spider stands there and why it was shown.
     




      It follows the life of a novelist, Gerard Reeve, who met girl named Christine and becomes sexuality involved with the woman. Christine is an attractive treasurer of the company that Gerard is working in.

                 

Eventually he found out, himself, that Christine is somewhat a lot like a devil, black widow or a witch. He found out that Christine had already been married three times. He found it out through the video tapes which he saw inside Christine's vault. All of the three were dead. Gerard became paranoid about it and thought he might be the fourth man.

                  Christine's other lover, Herman, was warned by Gerard that he has to be careful to Christine. He also might be the fourth man whose she's going to marry and also die eventually like what happened to her three previous husbands. Herman did not believe Gerard. Suddenly, he had a car accident and died. Gerard's suspicions to Christine were all true.

This film has to do with religion. Christianity is involved.

• Gerard sees a woman with a child and she peels an apple and shapes it into a halo and put it over her child's head. The mother and the child that he saw in the train somewhat symbolizes Mary and Jesus. 
• Another thing, a spider was shown over a figure of Jesus in crucifixion.
• Herman was crucified in a cross.

This film shows the Christianity of Gerard Reve, that has faith in Mary and Jesus. He thought he was saved by Mary.

I have put some clips that I found on youtube, you can watch some of the scenes.