There are many gods, but there is only one true God. There are thousands of ideas offered by many religions, but there is only one way to be saved today. There is one Lord, one faith and one baptism. All the people in the book of Acts including the apostles and Mary, the mother of Jesus believed that in order to be saved we must obey God as his grace and mercy stands by to witness the fact that we really are believers as we are willing to repent and be baptized in the name of Jesus, receiving the Holy Ghost (Spirit of Christ in us) speaking in tongues as the Spirit of God gives the utterance. That is how all the people in the book of Acts were saved. Nobody in the book of Acts was everycalled Christian until after they had repented and been baptized in the name of Jesus and received the Holy Ghost. This same true salvation plan is still available today for every sincere believer. If you really want to know that you are saved, do exactly what was commanded in Acts 2:38 just like they did it on the day of Pentecost in Acts 2.