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Also I’m in Colorado

Brazil and the United States are both parties to the Hague Apostille Convention, which means that they will recognize each other's official documents  if they have a certification,  called an apostille,  from the government that issued them. 

The general rule for US documents is that Federal documents,  like your Background Check, need an apostille from the US Department of State in Washington.   State documents,  like your birth certificate and your divorce decree, need an apostille from the state that issued them.  To find out who a state authority is, do a search on "Apostille Authority,  State of ________".  It's often the state's Secretary of
State,  but not always.

Passports do not need apostilles.

There are services you can pay to obtain your apostilles, if it's not practical to get them yourself.

Apostilles are affixed to documents in such a way that removing or damaging them will invalidate the document,  so have duplicate originals, or at least make copies before the apostilles are affixed.

All documents in a language other than Portuguese,  both document and apostille,  need to be translated by a Sworn Translator, a person officially authorized to provide translations for government use.  You can find one  by doing a search on "Tradutores Juramentados" once you get to Brazil.

So will I need my birth certificate because the lady at the federal police in lapa told me I need only my fbi background check apostille not my birth certificate or divorce decree she also told me I won’t need my birth certificate if I have a divorce decree I just need too make sure I have all the documents ready so I don’t leave with missing documents
So she basically told me for the marriage part I need only my passport and divorce decree never said it had too be apostille

You're dealing with two different authorities,  and they don't talk to each other.   They also don't control each other, so one giving you a pass on something doesn't necessarily mean the other will.

For your marriage, the cartório, the notary office that your girlfriend chooses, is in charge.  Cartórios are private businesses regulated by the Judiciary  in Brazil.  They're the ones who need your divorce decree, and they can be as picky as they want to be about proof that your previous marriage was legally terminated.   Every cartório is a little different,  but you don't need to work in the dark on this one:  your girlfriend should be able to get a list of the documents they require directly from the cartório,  so you'll know exactly.

For your residency authorization,  you're dealing with the Federal Police,  under the Ministry of Justice.     They need a legal document that shows the names of both of your parents:  a birth certificate is the one that's commonly used, and one they're accustomed to seeing, but if your divorce decree includes that information, they may accept it.  The list of documents that they require is on their website, and the same nationwide; bring every one that applies to your situation.

I'd have an apostille on every document for the Federal Police,  except the passport.  I'd have them on the cartório documents, too:  the more official they look, the less likely they are to inspire questions.   The fewer questions, the less chance to be rejected.  Sworn Translations for everything.