Do you imagine God cannot know the heart? That he must wait for some sign to know who is trusting in him.
Certainly He can. Yet He does not. Read through the OT, there is not a single case of someone being offered a blessing that does not also have a requirement for action. Naaman had to dip in Jordan seven times before he was cleansed, the nation had to march around Jericho seven days before the walls fell, the widow had to gather jars and pour the oil, the other widow had to offer her last cake to the prophet, Moses had to offer Isaac on the alter, etc.
And you imagine because someone is waster baptized they will follow him for the rest of their life and be obedient
That is not a given, at all. But someone who is not baptized has not even begun to follow Him. Baptism is the entry point, it is the start of a new life in Christ. It is where the old man dies and the new man is created. The old man goes into the water and dies there, and the new man is born there and comes out of the water.
In your mind. I noted what I mean by believe so you attack a strawman
Oxford Dictionary:
Believe
1. accept (something) as true; feel sure of the truth of
2. hold (something) as an opinion; think or suppose
This is the dictionary definition of "believe". It has no reference to faith, trust, or obedience. Intellectual assent is not a "strawman", it is in reference to what you seem to think "belief" is. Belief in the Bible is not just a mental exercise, and after you have this thought in your heart you are saved and then go get baptized to show that you have been saved. That is not what Scripture says.
One can confess without water baptism so that offer no support for your position
Yes they can, but they are not saved with only the confession.
Rom 6 does not mention water baptism and speak of a real baptism into Christ effected by the Holy Spirit
We have already been over this many times. There is only one baptism in the NT Church, and it MUST include water (1 Pet 3:21, Acts 8:36) and it is something that man must do and receive (Matt 28:19, Acts 2:38), and it results in receiving salvation (Rom 6:1-7, Col 2:11-14).
There is nothing about a burial into water in col 2. You are assumiing water
We have already been over this many times. There is only one baptism in the NT Church, and it MUST include water (1 Pet 3:21, Acts 8:36) and it is something that man must do and receive (Matt 28:19, Acts 2:38), and it results in receiving salvation (Rom 6:1-7, Col 2:11-14).
Eph 5:26 shows it is the word which washes
Through water by the Word. It is not the Word that washes, it is in water by the Word that we are washed.
Gal 3:26 says nothing about baptism into water but into Christ
We have already been over this many times. There is only one baptism in the NT Church, and it MUST include water (1 Pet 3:21, Acts 8:36) and it is something that man must do and receive (Matt 28:19, Acts 2:38), and it results in receiving salvation (Rom 6:1-7, Col 2:11-14).
This is a function of the Holy Spirit
1 Corinthians 12:13 (LEB) — 13 For by one Spirit we were all baptized into one body, whether Jews or Greeks, whether slaves or free persons, and all were made to drink one Spirit.
repentance yes but one can be baptized with water without truly repenting and repentance should logically precede being water baptized
You keep going back to 1 Cor 12:13, but it does not exclude water baptism. It is in water that the Holy Spirit does the work of bringing us into the One Body of Christ. He does not do this on His own, at some random time when a person thinks in their head/heart that the Gospel is true. It happens when God said it happens, during water baptism (the only baptism in the NT Church).