In Matt 23: 29-32, Jesus said:
Woe to you, scribes and Pharisees, hypocrites! Because you build the tombs of the prophets and adorn the monuments of the righteous, and say, ‘If we had lived in the days of our fathers, we would not have been partakers with them in the blood of the prophets.’ Therefore you are witnesses against yourselves that you are sons of those who murdered the prophets. Fill up, then, the measure of your fathers’ guilt.
How serious is it when we identify with someone, or something? In the text above, Jesus said those he was speaking to were so aligned that they entered into the guilt of their (the fathers’) actions.
Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new.
Read it for yourself. 