Okay if what you mean by meaning not being "inherent" is that meaning is not etched into the very fabric of the universe waiting to be found by sentient beings, then yes of course I agree. Meaning is a cognitive construct. No cognition, no meaning. I think most everybody would take that as a given.
However, I don't think that is what many (if any people) mean when they say that. When it is said that meaning is inherent in something, that is a short hand for saying that there is a widely held consensus within a specific cultural context on the meaning of something.
For example, when a playwrite writes a scene without "inherent meaning", that is just a short hand way of saying something to the effective of, "This scene was written in a way that makes it very difficult for the audience to reach a consensus on its meaning or decipher what I (the playwrite) wished to communicate based on their common cultural references."
To take your example of a crucifix, it has inherent meaning, in that the culture in which it exists has come to a broad consensus that it symbolizes Christianity.