No, not necessarily. Check out
Apathia's mother.
Being uninterested in something is so very different from having any view, even a negative view, about it.
Might life have been brought to earth via meteors? That may be a very important question for many, it may be a not-very-important-but-nevertheless-not-wholly-unimportant question for many others, and a wholly and entirely unimportant and uninteresting question for a great many others.
So why not with the God question as well?
(Sorry about the somewhat garbled response. I have no set view on this. I'm feeling my way forward, thinking aloud, in trying to respond to your post.)
Yes, if life is actually proved to have originated on meteors, then it is conceivable that many who are apathetic about that question will begin to take an interest. I suppose that can be said about the God question too?
In ages past, when God was such an important part of one's day-to-day life, perhaps you are right, perhaps one could not really have been uninterested unless one were an atheist. But today? Today I think that is perfectly plausible.