salam 'alikum,I hope everything's alright,I was concerned about this matter,because it happened in the past to share some words with some non believers,and basing on my little knowledge on Islam,I could see that also the hardest of the non believers,in reality believes,it's a question of pride/ignorance/convenience.I also think that if only Allah has given the predisposition to His slave to be a believer,it would need less than 5 minutes to unlock his heart