Because it's being pushed by eugenicists who come from Fascist schools of thought. Their goal is to purify the human race of all defects.
Now, why would eugenicists, who support the cruel and unusual demise of fetuses (may I snip your spinal cord please?), and already have more than 50% of black infants aborted in New York, be so endeared to "help" gays?
Gaydom is a complex genetic deformation, and has many different variations, and these variations are seen in the emotional and behavior manifestation of each individual gay person. So why would eugenicists want the gays to succeed in their "agenda" and most importantly --- the MARRIAGE agenda?
Well you see, no Church is going to marry gays, nor do the eugenicists want that. They want gays to obtain a legal (government) "Civil Union" contract, which would REGISTERED with the respective government, and would constitute near-absolute proof that both of the individuals are gay.
Now, Second Amendment advocates greatly fear the REGISTRY because it allows the government to act with precision to confiscate firearms at a later date. This is why a a REGISTRATION is opposed. Who the **** is the government to know whether or not I have a firearm, it's my ******* right.
Returning to Gaydom. Once the gays are all on a registry, it makes it very easy (at a later date) for the eugenicists to label them with a Pink Triangle, just as they did in Nazi Germany, and then round them up and exterminate them not too long after.
So the reason I oppose the "gay agenda" is because there is ABSOLUTELY NOTHING stopping two gay men from living together. It already is your right to bind yourself socially and spiritually with any other human being, or even multiple human beings. Polygamy might not be legal, but there's nothing illegal about 20 women living with one man.
Get it? You already have the ******* right. The State does not "create rights," you have them at birth. You have the right to contract, in this case a spiritual contract. Enjoy!
Once you let the government get involved with "spiritual contracts" they are no longer a right, but a privilege, that can be denied or disparaged at any time. Do these words sound familiar? Oh it's the Ninth Amendment:
The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people
If yo don't like that Churches won't marry you, then start you own religion or your own denomination of an already existing religion that allows your marriage preferences, it is your FIRST AMENDMENT RIGHT.
And before you say "what about benefits, liabilities, [+insert ENDLESS bullshit here]"
This is why government should have gotten involved with this shit to begin with, because it opens a can of worms.
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So my first reason to oppose Gay Marriage is because it's based on the flawed philosophy that Marriage is a privilege, instead of a right. Marriage is a spiritual contract (or social if you're not religious).
My second point of opposition is that it is being pushed by Statist/Eugencists who would like nothing more than a registry of all gays, so that they may further expunge that genetic defect from the human race. They wish to usurp God, the Creator, and pervert his Creation. They are Satanists, as evidenced by the millions of murdered fetuses.
So, for the SAFETY of the Gay Community, I would urge you to become Libertarian and abolish marriage benefits/taxcredits/etc altogether. The Ninth Amendment has already provided you with that right to enter spiritual contract.
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As to adoption? Sure, why not? So long as you're not a convicted felon and have a steady and reliable income, no one should be barred from adopting a child.