You specified a genuine difference between the two cars. Now you're claiming the opposite. So your examples aren't even internally consistent.

that was a fairly striaght forward metaphor, so I'm not sure how to explain it further without just repeating the same words unless this is nitpicking for the sake of providing a counter argument ?
Car look same, speed not same, value based on brand image degraded.
You're also making up differences between marriage and marriage and using those differences that you made up as support for your argument that there are differences between marriage and marriage. That's not just an obviously circular argument, it's a circular argument wholly based on an entirely fictional distinction.
if marriage is a bit of paper then yes, but it's not.
Married people have a defined status within society that most people aspire to, what does a gay marriage symbolise to society ? That we can distort anything and everything just so that 1% of society gets to pretend they are not a minority.
Short people are always going to be short, banning high heels isn't going to change that.
Marriage has always been about procreation, pretending it's also for sexually incomparable people is facile.
It's like banning racist language, people will still think the same even if you take their means of expression away.
People will look at a gay 'married' couple and think they are aping a hetro couple while are pretending they don't stick out like sore thumb. They will, people will still see the enormous pretence involved, see the lack of children and wonder what the point of it all was. All that fuss just to get a badge that people will still see as 'pretend marriage'
If you actually believed that statement, you'd be campaigning for Christian marriages to be made illegal. After all, marriage predates Christianity and therefore, according to your own argument, Christian marriages are worthless copies of marriages, grabbed only for the sake of the associated kudos.
That is a pretty meaningless distinction in today's society, nobody equates their current position with history several centuries ago. Our current society was created with religion at it's core, therefore marriage is commonly understood to be a Christian concept and it is still valued on that basis. You think of marriage and you think of a church, a life long commitment and it being between a man and a woman.
Marriage in that context provides a safe and agreed way for people to mate, the woman is provided with security so that when she gives up her virginity she is still protected. Because it is a social contract, men do not later renege on the deal (unless they are a king and have a handy axe)
Using the argument of yours that I replied to, allowing Muslim marriages be legal in this society is disruptive and breaks down social cohesion. I don't believe that - I was using your line of argument.
The mere existence of Muslims within a Christian society is patently disruptive so it's irrelevant what marriage arrangements they make. If they for example allowed gay marriages it would be less disruptive than redefining the Christian concept of marriage.
To detour slightly, when this happens (and it will, clearly the aim for all parties is to undermine religion and replace it with state control), some lesser churches will begin to offer gay marriages in a church, this then undermines Christianity as a whole as people will question why one group allows it and others don't and as a result it discredits the integrity of all churches.
I'd assumed that you weren't being insanely irrational and arguing that homosexual relationships completely end society, creating chaos on a national scale and making it a free for all anarchy without any social cohesion at all.
It's a retrograde step, you'd have to be blind not to have noticed that moral standards within society have declined as each new generation seeks greater freedom for itself.
You don't have to look further than the internet to appreciate that people have a dark side, and that isn't just some imaginary population of oddballs, it applies to everyone. Even at the simple level of stealing films without censure is now the norm.
Yes the church is mostly static, it doesn't follow society because society is consuming itself, not stealing from your fellow man is obvious yet now it happens and we fall over ourselves to justify it. Man is inherently self destructive to himself and others, give him freedom to do anything and it will only head in one direction. People only want to win the lottery, never to appreciate what they already have.
Marriage is the cornerstone of most peoples lives, it symbolises a particular act of union and is the accepted path to having children. Those couples define our society as they repeat the same process generation after generation. Gays and for that matter eunuchs, stand outside that cycle. Pretending they don't by giving them a badge that says 'married' is pointless. Subverting that instituon for the arbitrary concept of fairness only undermines it because we all know that at it's core a gay marriage is a barren sham.