They are either all false or one of them is true.
I fully agree in principal, but I would take issue with the word "religion." People confuse "faith" with "religion" and that creates a lot of confusion.
"Faith" is what you believe. "Religion" is an organized group of like-minded believers, or those who profess to hold to certain principals or tenets of a faith.
Faith is personal. Religion is social.
While organized religious activities are important, faith is the key. It starts there.
Good point. That is the fallacy of the Bahai faith. The only way you can assert that all religions are really the same is to determine to be grossly ignorant of most of them, to stand at such a distance from any of them that they at least kind of look the same, and then use that as the justification of going about living your own life as you please. It's a hippie version of going to confession in the morning so you can get drunk at night guilt free. It innoculates the soul against the ramifications of there in fact being an infinite personal God.
They are either all false or one of them is true.
What if they are all true? Did you ever read the tale of the blind men and the elephant?