They are not the same, at all. Imagine this:

Person A wears a shirt with a picture of spider-man on it. They then turn you and begin talk at length about the amazing work of spider-man and that everyone should believe he is real, all they need do is feel it in their hearts.

Now imagine this:

Person B wears a shirt with their favorite sports team on it. They turn you and ask if you also like the same team.

Just be clear, the point i'm making is that john 3:16 is part of something that is made up but people believe its real because it "feels right". The other is just something you enjoy. They are nothing alike.

What the hell is 3:18?

Are you really suggesting that telling people that there is no way to know whether a god exists or not is the same as telling people that god came to earth to sacrifice himself to himself on their behalf?

I don't know...the points are all F-ed up now so looks like I'll never get my free t-shirt. Total BS that I don't get something free that I really have no right to in the first place but still feel entitled to, damn it!

It’s 3:16 and only if you’re doing it around a group of other agnostics

I don't think there is any type of quote or verse associated with the agnostic.com tee, is there? Is it embedded in the logo? And what ideology does it promote? This site supports a range of them...including analytical thinking...so...nope...besides, mine will probably be turned into a dust rag or t-shirt rug...