In short, an Orthodox person having a wedding outside of the Church forfeits their ability to partake in the sacramental life of the Church. At least until that is rectified by having a wedding or blessing ceremony within the Church. And of course, the Church cannot conduct a wedding on a mixed faith couple.
The last two sentences are illogical.
Nope, they actually aren't. But logic ain't usually the Church's guideline for teaching.
Either way, that's the Church's position here. Read up before spouting off, fella.
So accordingly to you the Church' position is not to let the Orthodox spouse to partake in sacraments without the Church marriage but the Church won't give that person Church marriage?
Correct, although it is not my position. It's from what I read (have you read what I linked to?). At least until the non-Orthodox spouse becomes Orthodox (or some form of Trinitarian Christian) and they marry within the Church. That's how the GOARCH and other sites explained it.
I think I understand the confusion and "logic" comment. Basically, that one can't partake in a sacrament until they partake in a sacrament. I think they're more specifically referring to communion, burial, etc. I guess the sacrament of marriage would still be open [explained in post below]. So, I think I get what you were saying, but it seems to be a measure of oeconomia to give people an opportunity to return to full communion.
[Redacted, as the below posts explains it better].
As Fr. Meyendorff writes, this whole confusion could be eliminated by returning the sacrament of marriage to that of the Eucharistic service, which was apparently how it originated.