Felix,
I don't use the NIV... never have, I don't find it a reliable translation due to many of the reasons you bring up...
I'm assuming that you're not a scholar...
The reason for my question isn't to attack you... I admit that sometimes I do go on the attack, but that's no my intention now.
The reason for my question is because I've checked several Greek lexicons... granted most go straight back to Strong's, but then Strongs is a highly reliable lexicon that is overwhelming accepted as correct, but there are a few others out there...
And, the lexicons and dictionarys of biblical Greek I looked at include a metaphorical definition of eunouchos as"one who voluntarily abstains from marriage".
Now, if you were a scholar of Biblical Greek and can give solid reasons why I should discount this metaphorical definition of eunouchos I'm open to listening.
But, so far, your argument against looking at this text is coming down to just examining the text itself... not a bad strategy by anymeans, but you included in one of your arguments this: "Sorry, nothing in Greek says this"
I've checked several sources of Biblical Greek and yes, the Greek word does have a metiphorical definition of one voluntarily abstaining from marriage.
Note the definition is voluntarily abstaining from marriage, not sex. This was discussed earilier, that this isn't mere celibacy outside of marriage... it's a committment of a lifetime of celebacy due to serving the kingdom. More than just celebacy, which is why Jesus isn't speaking of celibacy. Anyone single is called to celibacy, but not a lifetime of it, for they are free to marry.
However, there are those whom God does indeed call to be single, again John the Baptist comes to mind, as does Paul... not teaching that in the general way all men should committ to being single, but that some will be convicted of the indiviual call to remain single and commit their life to the work of the kingdom. There is a big difference between telling others they are not to marry, and an individual being convicted to remain single for life in service to God.
And, as Jethro points out, there are those in marriages that are forced to ether spousal rape or celibacy... and since the context of this passage indicates that one's spouse refuseing sex is no cause for divorce, the spouse who desires sex must either a: rape, a sin; b: divorce, a sin; c: commit adultery, a sin; or d: live the life of a eunuch, one who cannot have sex.
I counter the claim that "There is no known vision or a prophecy or parable which is half metaphor and half literal" with... Perhaps not, but Matthew 19 is a text which shows that the common liguistic practice of mixing the literal with the metaphor is at work here. It's not a vision, prophecy or parable, it's simply a teaching of Christ, but one in which the basic reading of the text will indicate that Jesus is using the literal eunuchs, those born asexual or mutilated as a metaphor for those who voluntarily live a single life (or if married a celibate life) in order to serve the kingdom of God.
And, this isn't the only time Christ does this... John 4:7-16 is an example in which the literal and the metaphoric is being interchanged in order to make a spiritual point. John 6 is yet another example, when Jesus changes from speaking of the literal manna to being the Bread of Life, a metaphoric statement.
I'm unaware of any questions you've asked me that I haven't tried to address. Point them out, and I'll do my best.