Hello,
Ephesians 4:4-6 says there is one baptism. Paul wrote to the Ephesians in 61 to 63 AD which was about 30 years after the start of the church. Matthew 28: 19-20 tells us four things. First, Jesus tells us that we're supposed to make disciples. Second, Jesus tells us to baptize them in the name of the father and the Son and the Holy Spirit. Note: Men baptized in water God baptizes in the Holy Spirit. Third, Matthew 28: 20 tells us that we are to continue to teach them. Fourth, so, discipling, baptizing, and continue to teach people was to continue to the end of the world.
So the only baptism that we can do today is baptism in water. This is further confirmed by Ephesians 5:25-27 Husbands, LOVE your wives, just as Christ also LOVED the church and gave Himself up for her, 26 - so that He might sanctify her, having cleansed her by the washing of water with the declaration, 27 - that He might present to Himself the church in all her glory, having no spot or wrinkle or any such thing; but that she would be holy and blameless.
This word washing according to Strong's is a bath, which means to bathe the whole person. This refers to baptism in water as commanded by Jesus in Matthew 28: 19-20. So in the book of Acts, in the nine conversions mentioned, everyone was immersed in water the same day that they believed.
I might mention also, that it says in Psalms 119: 160 that the sum of God's word is truth. Just because water is not mentioned in every baptism in the book of Acts common does not mean that it was not done in water. Also, whenever it mentions a purpose or result of being baptized it is always for something connected to Salvation. So, just because some times the purpose is not given, does not mean that it was not for the purpose of being saved.
In every other instance, when people are examining a subject in the Bible, they realize and understand that the subject they're studying may be found in many other places in God's word. If one really wanted to study this subject of Salvation he would look up every scripture that were saved common saved, or saved. And whatever the Bible said that saves us would include everything that Bible said that saves us.
Thank you very much!
Wayne