Sorry but that's rubbish. "We" certainly do not all agree on this. Even if we let the religious aspect aside for a moment, I think you'd have a hard time finding a lot of scientific proof for your claim. Firstly we would have to agree on what 'talent' really means. Let's split 'talent' into three possible components: 1) physical predisposition, 2) motor function/sensory abilities and 3) intellectual abilities.
There are certainly a few aspects of talent that are genetically determined to a certain degree like e.g. having long fingers for playing piano, being tall for playing basketball. Basically these are predispositions that give you an edge in a certain field and if you do not have them, you may even be unable to do a certain thing (if you have very short fingers there are a few pieces you simply cannot play on the piano).
But once we stop talking about these very basic predispositions we start getting into the whole nature/nurture debate.
Let's talk about point 2. We might consider such talents as having an absolute pitch or having remarkably good or precise motor functions an innate talent but that's not proven at all. It's just as likely that they develop in early childhood.
And last but not least there's point 3. We do accept that part of our intellectual abilities has to do with genetic predispositions and/or childhood development but we also generally agree that this is an aspect we can improve by hard work and dedication. And we do know that social aspects play an enormously important role in this.
Now the argument about talent in photography (if there is one) seems to be whether it mostly comes down to 2 or 3. The people who argue that being good at photography requires having an 'eye' for it would probably want to put this in category 2 together with things like having an absolute pitch. This reasoning is highly flawed in my opinion as the visual equivalent of having an aboslute pitch would seem to be something like being able to distinguish the slightest variation in color, not being able to produce a good image.
If, however, you subscribe to the view that photography is a sort of visual language then it follows that it can be learned. I'm sure that a lot of that learning goes on in early development but that doesn't mean that one cannot make up for it later in life. A lot of young people today seem to have remarkable visual literacy (having grown up with blogging and reblogging etc. etc.) and I do sometimes struggle with this when I see a photographer that's better at 15 than I was at 25 but that's just the way it is.