Look and read vs. 3 again where it says "in time past" which means in time past before we came to faith in Christ. No one is born with faith from their mothers womb. Read Psalms 58.fhg
In the context of Eph 2:3 its the Elect as well as others by nature.
Our nature is that of being born with a nature to sin, which we all have fallen short, but now by God's grace we can reconcile ourselves before Him by faith through Christ Jesus in whom we first have to believe in.