I'm an atheist. I can't know for sure that there are no gods, however if they're trying to talk to me they're even less straightforward than NT's I'm romantically interested in. If there are gods, then they obviously don't want to tell me what the purpose of life is or what the right thing to do is. If there are gods, they must want me to figure this stuff out for myself. Believing in them cannot clarify anything, it can only complicate things and life is complicated enough already. I must take responsibility for my own actions rather than attributing them to a higher power.
Any religious texts I've read have (necessarily) left the important things for me to figure out on my own. Life is much too complicated for there to be an all-encompassing owner's manual, nobody can prepare a person for everything in their lives such that they don't have to think for themselves in order to do what is right. Any attempt to learn a system that will figure this out for you is a waste of time, what is necessary for living a good life is to figure out how to figure this out for yourself.
You may have access to someone who claims to understand some religious text well, however they will not know your life as you do, they will not understand your situation as you do. Any intelligent and empathetic person who takes the time and trouble to make an honest effort at living a good life will be better able to reliably decide for themselves what is right than someone else is able to make their decisions for them.
One can get good ideas from other people, and from books, I recommend this. Nobody can write a book that will tell you about the exact situation you will find yourself in next Wednesday, nor can they write a book that will tell you what, exactly, you should do in that situation. Your judgement will always be called upon if you're to make the right choice... if your judgement is that you should do what someone else tells you to do, you have decided to avoid moral responsibility. At best you will be a tool of a decent person, at worst you will be a tool of an evil person.
It's possible that some people are not bright enough to live a moral life without instruction. Perhaps for those people religion is actually a good thing. Rather like a legal system. Following the laws of your country will not make you a good person, and breaking them will not necessarily make you a bad person. Following the laws will force a really bad person to be less obviously and directly bad. Some real assholes operate well within the system and use it to their benefit. If you blindly follow along you are enabling those assholes.
This makes me wonder what you think 'valid' means, and what believing in something means to you. I wonder if you have considered that many people attack and make fun of neonazis. Do you admire the strength it takes to continue to be a neonazi? When peoples of two religions go to war with each other do you admire and respect the decisions of the people on both sides to kill the people on the other sides? Seems kinda silly to me. Doesn't at least one side have to be wrong? Perhaps you don't want to think about this. One of the 'benefits' of religion is that it makes the hard work of thinking about what is right and wrong go away, someone else can decide that for you, it's much easier.