To Christen or not to christen

So im 29 weeks pregnant, and for context: im not religious- possibly agnostic (like im open to possibilityof something being out there but i certainly dont think its in any man made religion or text that gets passed and changed by men, but i do believe theres something after our current existence and believe in spirits etc) and im happy to talk about religion but im not a follower of anything. My partner has said hes aetheist and was a straight up "nope you die your dead thats it" kind of bloke. His Grandma is christian and does hold to some of the ideals with that.Anyway; more recently hes been suggesting having our kid christened- hes mentioned his grandmas mentioned it to him (which i dont mind shes not the forcing type), and i had joked that no i hadnt considered it seeing as we was both not religious, im not christened myself,i was born out of wedlocke as will our child be and neither of us has so much as set foot in a church in decades so we'd probably burn on the spot touching hallowed ground. He mentions it as a "just in case" scenario (as in "if heaven is real we wanna make sure he can get in" kind of way) and whilst this has lead to me explaining hes probably agnostic then and not realised the difference it has made me start to wonder if we should. If it had stayed as just his grandma mentioning it id have likely shrugged it off but now he as the father is wanting to do it? I always figured if our kid wanted to explore a religion when hes older we'd do so then because as i mentioned i dont particularly mind its just not for me but now idk