This was one of the revelations I received when I first encountered God (in my case through Jesus) that my belief or non belief had no baring whatsoever on His existence.
It sounds such a silly supposition to think it would, but I believe many people subconsciously think this way, (that since so few folks believe nowadays He can’t be real). Then there’s the widespread thought that mankind “invented” the idea of God to fill his need for something beyond himself – that one hampered me for many years.
I’ve often said that in my case finding God was like walking into a lamppost. The “post” was solid, to think that it needed my belief would be absurd!
I realized I’d not been seeking God as much as He’d been seeking me, it all began with Him not me (humbling but so awesomely wonderful!).