if this were a multiple choice question, my answer must be "none of the above".

what is your defnition of "best"? Best at putting power into the hands of a select few who control access to "god(s)? Or best at dividing people into Them vs. Us? Or best at practicing hypocrisy?

Religions are under no constraint to promote the betterment of mankind and/or the planet, or to practice what they preach if the original founders had that in mind at the beginning. And most folks prefer the religious belief system that they grew up in and feel comfortable with... imho, based on my experience with religion and the folks who practice it.

And then there are those for whom religion is uncomfortable at best and find they are quite content without it. And also darn sick & tired of having to deal with those who feel it is their mission to "save" us from our ill chosen path. Then it would be really nice to believe in hell so we could consign them to it. But.. no such luck.