What the statement In Adam's fall, we sinned all means is that through Adam we all were exposed to be people of sinful nature becasue it caused it to fall out with God and he is the first man.
Adam is the first man that was created by God according to the hioly biuble. He was said to have sinned against God when he went against the instructions that he was given.
Hence through him sin came to be existent in the world. As his dire t descendants, sin also got to be associated with the rest of mankind.
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