approve of non-religious rituals such as offered by the BHA,

Yes.

and why or why not.

Because I like rituals. C'mon, this is a folk based forum!

What do such organizations have in common with churches,

People.

what not?

Religion.

What do (potential) members really want?

I want entertainment. No idea about anyone else.

Does organized "humanism" (meaning atheism plus some "positive" content) amount to an ideology?

No.

Would you wish existing church organizations to be transformed into such services?

No.

Do I pass?

:D