If Life is Meaningless Anyway, then What's Wrong with Religion?

[Thumpalumpacus]

But it's not just "what you do". It doing things in a very specific manner, no matter what it is you wish to do, for fear of losing out in the afterlife. You're right that "what you do in this life" is important to them -- and that "what you do" is obey the religious authorities insofar as what they define as sins.

How meaningful is that existence?

To know that the are consequences both good and bad for our actions? Very meaningful.

And how is that exclusive to the Abrahamic faiths?

To have them dictated to you without explanation or understanding....not very.

... or evidence, for that matter ...