i do not see it as impossible. Sure we might not be physcially persecuted as Peter, but we can be if we are truly in the world talking and witnessing to non believers about the truth as he did. Meaning not just when an occasion arises as we're there, but to go out and create the occasions. This is going into all parts of the communities asking questions through the Law of Moses, if they are a good person and expose to them asking if they are sinners just as you are. Let them know how they are, as you are, but being the difference in you now in how God sent His Son to pay the price for your sins and the same for them if they repent. If done as God's word says with love their conscience will bear witness to the truth. they still might deny it but as Psalm 19:7 tells us "The Law of the Lord is perfect, converting the soul of a man". Romans tell us all people are without excuse and the Law is written in all men hearts. If the people today are comfortable with the materialism of the world it's their own choosing. Peter's faith was not always as strong as his turned out to be, but through us being obedient and trusting we too can have the faith of Peter. Faith has to be used to grow. It's all about choices, the same as when we accepted Jesus Christ as our Savior and to make Him LORD OVER OUR LIVES! Not just accepting Him and believing but being obedient to His commandments, all of them. To live a life as this you will meet persecution as though your life is threatened or you felt as though it was.