とする？
 

I recently started trying to translate various things off the internet into English to increase my vocab and reading skills XD, and the other day I was trying to translate a small paragraph off of wikipedia about buddhism and とする was in it can anybody explain this grammar point to me? The sentence is 仏教は、インドの釈迦（ゴータマ・シッダッタあるいは ガウタマ・シッダールタ）を開祖とする宗教である。

I think here とする is acting a bit like a hypothesis/assumption. That is one of the behaviors of this structure.

I think I'd translate it "Buddhism is a religion purportedly founded by the Buddha (aka Siddharta Gautama) of India."

Now, I'm confused by the use of を after 釈迦, personally. 釈迦を開祖 seems like a weird construction. Given my (limited) knowledge of Buddhism, shouldn't it be 釈迦が or の? But I admittedly am not a master of とする. :)

「～～をＸＸとする」is a frequently used phrase meaning "to put ~~ into the XX position", "to appoint ~~ to be XX", etc. There are no particle mistakes in the ohrase 「釈迦を開祖とする」.　Neither が nor の is possible.

In the phrase 「釈迦を開祖とする宗教である」, 「釈迦を開祖とする」is a relative clause modifying 「宗教」.
＿＿＿＿

To OP:
You may want to correct your sig. We do not ever say くれろ.

So, in that case, something like "Buddhism is the religion in which [the] Buddha has been designated as founder."

Or, more artfully in English, "...the religion founded by Buddha."

Thanks!

Thank for the help, and about my sig I wanted to make it more demanding than polite so I went with the imperative form of the verb. Is there a different verb form which would sound correct to a native speaker, but have the same meaning as I tried to write?

The non-polite imperative form of　「くれる」 is　「くれ」 not 「くれろ」.

I know you wanted the imperative but the imperative form is 「くれ」, not 「くれろ」.

EDIT: StonerPenguin beat me to it.

Thanks I will change it now!