Not just Catholics and Lutherans, but Presbyterians, Methodists, Wesleyans, Episcopalians, and, yes, Mormons and Jehovah's Witnesses. Church of Christ, even.
To state an absolute fact, churches of Christ are not protestant churches. If you had studied this subject as you say you have, you would have known this fact. Churches of Christ belong in the "restoration" category. Protestants are in the "reformation".
Protestants are considered "reformation" because in one way or another, they keep a base model of what Catholics taught. Thus, as reformation's definition dictates, they merely just "improve" upon an already faulty belief. Sure they speak truth in some areas. However, they still teach falsely in other areas.
Baptism in the Spirit is what happened in Acts chapters 2 and 8 and 10.
You are wrong about Acts 8.
Only two times in the NT did the Holy Spirit descend upon people in this fashion, Acts 2 and 10.
Problem with the people who say you are saved ONLY with this method, is they forget Cornelius and his household and friends STILL had to be baptized into water.
Everyone in Acts 8 was also baptized into water.
John 3:7 :
"Born of water" - It was Peter himself who said to Cornelius (Acts 10) "can anyone forbid them water.... and he commanded them to be baptized"
The Holy Spirit was to do this because the Jews believed they were the only ones who would be chosen (See Peter's explanation in Acts 11). God had shown the Jews right before their eyes that gentiles were also chosen.
Peter had also said "baptism now saves us" right after saying that through water Noah and family was saved.
Paul agrees with Peter when he told Titus, "He saved us, through the washing of regeneration
and renewing of the Holy Spirit,". Peter basically said the same thing in Acts 2:38 "be baptized...and you receive the Holy Spirit".
"and born of the Holy Spirit" (jn 3:7) This is what happens when you obey that which was commanded of us to become Christians.
Hear
Believe
repent
confess
be baptized
[insert receiving of Holy Spirit here as in effect following baptism through our obedience]
remain faithful
Peter and Paul said this
Titus 3:5/Romans 6:3-5
Acts 2:38/1 Peter 3:20-21
Lastly, you are taking Acts 8:16 out of context.
(NKJV)
14 Now when the apostles who were at Jerusalem heard that Samaria had received the word of God, they sent Peter and John to them,
15 who, when they had come down, prayed for them that they might receive the Holy Spirit.
16 For as yet He had fallen upon none of them. They had only been baptized in the name of the Lord Jesus.
17 Then they laid hands on them, and they received the Holy Spirit.
18 And when Simon saw that through the laying on of the apostles’ hands the Holy Spirit was given, he offered them money,
19 saying, “Give me this power also, that anyone on whom I lay hands may receive the Holy Spirit.”
Facts:
1-They sent Peter and John to Samaria
2- The Samarians had already received the word of God before Peter and John came (see previous verses)
But when they believed Philip as he preached the things concerning the kingdom of God and the name of Jesus Christ, both men and women were baptized.
Then Simon himself also believed; and when he was baptized he continued with Philip, and was amazed, seeing the miracles and signs which were done.
These are undeniable facts that you cannot disagree with. Now to the supposed discrepancy.
Peter and John came to Samaria to lay hands on them and give them miraculous gifts. Not to save them since they already were saved (verses 12-14).
So what you are propositioning, is that Peter and John came to "lay hands on" and "save" the Samarians through human means of "laying of hands".
This cannot be true. No one is taught to go around everywhere laying hands on people to save them. That is false and has no scriptural support.
What I see here, is that Peter and John came to lay hands and pass on miraculous gifts to the Samarians, who were ALREADY in a saved state aka Christians.
If we are saved by the laying of hands, then we are ALL doomed because there are no apostles alive that can do this for us. No, they were baptized in water just like the Ethiopian in the later part of Acts 8, and saved before Peter and John was sent. They merely were to receive miraculous gifts is all, by the laying of hands.