Wah rao eh, read until I 
***
To understand the crux of the whole damn homosexual
thingy is to know IF homosexuality is
congenital or by choice. Generally, common folks
believe that it came with your life (congenital), I believe, to
Christians, it's more like misused of freewill to rebel against God
(by choice). Regardless, till now, nobody really have the answer to
this question.
This debate is pretty meaningless because two parties are standing
on different side, shouting from different angles. What SIS and
those who sees in his view, would agree that it is congenital and
thus also a natural product of this world - something that God
(whether he believes there is such a thing) creates and knows about
it - thus NATURAL. 'God' cannot make something that he rejects or
not know of because God is perfect.
What our Christian forumites feels is that homosexuality is
unnatural because it is NOT a product made by God - somewhat a
decision made by man (sin) to rebel against God. Sins, which are no
difference from murder, stealing, etc. God give us the freewill to
choose and gays choose the path which would sadden God, therefore,
like other sins, there is a need to state a strong stand against
walking into such position.
***
One speaks about Science and the other... Religion.
Obviously there is a conflict.
Something to share with you people; yunhaier is slightly versed in
the Art of Astrology (old wisdom passed from the ancients, which
combined Science and Arts into one), AND homosexuality can be seen
from a person's astrology birthchart - I have seen before. (For
those interested, astrologically speaking, A person Gay often have
strong affliction in 5th & 7th house, involving Venus &
Uranus. No gay person are born without afflicted Uranus/Venus).
Before you go wtf you are talking about... one may probably ask
'then why.'
Because Christian doesn't believe in Reincarnation - this never
applies to them, thus rejected. (FYI, reincarnation and karma
together doesn't mean you kill a pig you will be reborn as a pig.
It's definitely not - but for this moment, short of explaination,
just think reincarnation as a beginning of a new chapter and ending
of an old one... and reprinting your entire personality into the
new chapter)
Cruelity in love from past lives (old chapter)
brought forth the affliction (into the new
chapter) because such qualities/attributes/behavior, ain't evolved
spiritually/emotionally/physically. E.g. If you have been
possessive in love in that lifetime and NOT evolved, this carries
it with you. (You will probably get some drift for the other
thingy).
***
What is homosexuality related to?
Issue of Love, Relationship and Sex. If you think very carefully,
this has little to do with anything else.
If you want to understand homosexuality, you got to know alot about
these three disciplines. Like-wise, Science cannot explain
Religion, vice vista, because these two thingy doesn't stand on
similar grounds, will clash when scientific views go against
theology views.
P.S: The Greek believe that lightning bolts were created when Zeus
is angry - that belief cease to exist when Science came into the
picture. Maybe when Man understand and grasp full knowledge in the
study of love, relationship and sex, the issue of homosexuality
will be clear? 
Cheers