“Did you receive the Spirit by works of the law or by hearing with faith?” – They (we) received by hearing with faith. So why are we living as if it was by works of the law?
“Does [God], who supplies the Spirit to you and works miracles among you do so by works of the law, or by hearing with faith?” – Faith has always been what is important to God. Obedience, like works of the law, should be done in faith, otherwise it is done in vain.
Abraham believed – it was evident in his actions – and it was credited to him as righteousness. All those who live by faith in God like Abraham did, are considered children of Abraham.
Cursed is everyone who does not abide by all the things written in the Law – therefore all of us are cursed. But Christ became the curse for us by dying on the cross and taking our place.