It's not against Jewish, Christian, or even Muslim faiths AFAIK. In fact I heard a rumor that it's approved for Muslims.

Use this, although you'll have to rewrite it: there are all sorts of fundamentalist-style preachers/exhorters, in every faith, who will claim that things like pot are "against their religion". Fine. Have them show it to you in their Bible. If it ain't mentioned, then it's proof that these people are false prophets!

I was thinking 11 x 17... is that good?

I believe that many of the current posters address many big issues ranging from hypocrisy to statistics and facts about how safe marijuana is... and that is great.

But I think the biggest opposition to marijuana are those that fall back on the belief that it is against their faith. With that in mind, I wanted to create a poster that had a bit of a religious slant to it in hopes of targeting that demographic.

If I want to make a Prop 19 posted, what dimensions should it be in?