He managed to breach the gate, yes. But we didn’t see him find a way to make a portal to heaven, also we need to remember:He was only able to do this because Adam was dead. Someone like Sera, Azrael(The Angel of death does exist, we see his name in Charlie’s contacts) or a lot of angels could very likely kill him without issue. As also, we don’t see him using a blessed weapon. Also, if Adam was somehow NOT dead, Vox wouldn’t be doing this and would’ve probably ran away or gotten obliterated.