No, I wouldn’t take an adult believing in Santa Claus seriously. They’re entitled to their beliefs and if they do their job well then I have no reason to have an issue with them.
The issue I take is with the equivocation they have made. Believing in Santa Claus and believing in a divine entity are two drastically different things.
Or is there a stop? And then what? Your stance creates more questions than it answers while introducing extra, unnecessary parameters.
Why? The only major difference I can see is that Santa Claus is explicitly understood as a made-up story, whereas Gods are believed in by others.
So there's social proof on the side of God, but in terms of tangible evidence they don't seem any different.
Moreover, what is stopping me from defining Santa Claus as a Devine being?
Show me evidence that Santa Clause sent a message to us.
To be pedantic, Santa sends me messages every year through Coco Cola commercials. But I'm going to assume you mean older messages.
Why not?