Sorry if I misunderstood your intent. It’s just that I personally have heard the “believing in God is the same as believing in Santa” argument so many times it’s kinda gotten under my skin.
I think the only answer I can give (other than reiterating that we
still believe in Santa (St. Nicholas), as
well as God - Catholics and Orthodox anyway

) is this, and I hope it makes sense. (FWIW I don’t want to get into an argument, or challenge you - I hate when people do that to me so please forgive me if I come off that way, I don’t mean to!

)
But here goes - the vast majority of people who believe in Santa and then later disbelieve are
children, who accept the idea of Santa as presented to them by their parents, but later find out either (a) there’s no Santa or (b) Santa is different than what they were told as kids. Not everyone decides there’s no Santa
at all (see above!). But sooner or later, every child must make this decision, as part of growing up.
In the same way, yes, it’s true that a lot of people (such as yourself) start out in life believing in God because of what their parents have told them, and later find out for themselves either that (a) there’s no God or (b) God is different than what they were told as kids. Either way you do have to examine the evidence and decide for yourself - you shouldn’t just rely on what other people have told you - because it’s part of growing up.
However, I hope you’ll also acknowledge that (b) may be as valid an answer for some people as (a) - because we each see the evidence through different “filters”. I totally acknowledge your right and your freedom to decide the evidence
doesn’t support the existence of God, and only ask that you also acknowledge my right and freedom to decide it
does.
(Also, it’s only fair to acknowledge that some people grow up
not believing in God, and later in life find evidence that causes them to change their minds. So in that sense it’s not comparable to the Santa Claus thing.)