It can be argued that they have no way of knowing the outcome of their reactions. And indeed, nor does Chris. What differentiates Chris from the rest of the crew is the love he feels for Rheya. Love in the end is the essential force that enables him to forgive both Rheya and himself, and in the end love both redeems and kills him. This dichotomy furthers the ineffability of both death and the god force symbolized by Solaris.

Chris chooses to remain on the doomed station rather than face further life without Rheya on earth. He has no way of knowing what the outcome will be and most likely believes that he will simply die. His "redemption" is therefore not based upon faith, but rather upon the love emotion. Emotion in this case takes the place of faith in redemptive force. Furthermore, his "afterlife" entails life with his love...
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