The only question is what Religion is true and what is false?
You say you dont belive, okay. BUT Imagine for a second that their is a superpower (G-d) who has commanded things that even seem illogical and at times "cruel" , if He is the one who Knows everything and what is good for us, the proper way in life and what is best for all of us, then why should you not follow him?
Now step 2 would be to prove without ANY doubt that that Superpower (G-d), exists and that the instructions (Torah) He gave is true or not. So one would have to look at the different religions and see if the evidence presented is 100% true, or it has human error. If it has human error you can throw it in the garbage (but you would have to make sure it is a true error and not your misunderstanding, so you would need to talk and debate with a Scolar that represents that religion), if after proof and after proof one doesn't find error, and see's that the information can only be Divine, then step #3 is to accept whatever G-d tells you, even if you do not understand what is writtten and even if it doesn't seem logical to you, since it is the Word of G-d you must follow it.
Now if you are jewish I or someone else can refer you to some video's that prove without a doubt that the Torah (both Written and Oral) is a Divine book that no human being could even make it up.