The Activation Lock is an invaluable security feature that you will soon grow to appreciate once you have a working phone.
I have to tell you that It can not be bypassed and requires your knowledge of the passwords or the help of the person who originally set it up to de-activate it.
Without such knowledge, the phone is of no further use.
This is Apples document which explains the feature and the whole de-activation process in more detail. https://support.apple.com/en-gb/HT201441