The Book of Acts is surely our manual for Christianity today. Yes, those were different times.(For detail on Acts chapter 2, see the next page heading "We Need a Christian Revolution") In the 21st Century we have the latest technology. Styles and fashions are different. Yet the important, basic things have not changed. God is the same now as then. Satan is the same. In fact we see his work everywhere in human misery. People and human nature have not changed either. So what applied then will apply now. Hebrews 13:8 - "Jesus Christ, the same yesterday, today and forever."
The Book of Acts says the apostles did the same as Jesus. They preached the gospel, healed the sick, even raised the dead. They didn't go looking for miracles. They simply focused on telling the gospel, in obeying Jesus, no matter what. The miracles came as a by-product of that. "And these signs shall follow those who believe. . ." Mark 16:17. Who are those who believe? Christians today. Next is the key to it all.
The apostles were sold out on Jesus. They were not focused on a career, or house or material possessions. They idolised Jesus. They went to jail for Him, were willing to die for Him - and some did!
It was the apostles' attitude of heart and mind that brought results. It was their dedication that moved God to supernatural events.
What they did was dynamic. Acts chapter 3 - Peter and John (in Jesus' name) healed the cripple at the gate. He had been lame from the womb. Chapter 16 - Paul and Silas were in jail but praising God. Suddenly there was an earthquake, and with no human action "all the doors were opened and everyone's chains were loosed." God did it.
He will today when we get back to that brand of Christianity. If you don't believe in miracles read "Healing the Sick" by T.L. Osborn. To read it is just like reading the New Testament, but it happened over the past 50 years.
Our blueprint for today is there in Acts. The believers had a passionate motivation to tell others. It was their reason for living. Nothing else mattered. With that attitude we would see God moving in a mighty and spectacular way today. "Jesus Christ, the same yesterday, today and forever." Hebrews 13:8.
There has to be a better way than today's (generally) weak and lukewarm Christianity of the western world. Acts hands us the key.