Church baptisms have their roots in the earliest churches which were established six thousand years ago. These early churches used the language of Latin which was the language of the Greek people and they also used a Greek language translation that consisted of a long list of vocabulary words that were specific to Greek. The idea was to never change or translate any part of the Bible that did not have Greek origin and this translated the text into an impossible language for the people to understand. Even six thousand years ago there were problems with Greek being the only language that the church leaders had available and it was not easy to get the membership of the church to accept this fact.
The concept of baptism was not limited to just the newborn babies but included adults as well. This was not a religious concept but it was a simple concept that included the washing of the feet, the solemn affirmation that you are now washed in the name of Jesus and that you are now bound for Christ. The concept of the church baptistry then moved to a portable baptism service that was done outdoors on a lake or a river. This was a much simpler occasion and it was much easier for the average person to get ready and to go because no real preparation had to be done before this time. For more insights, visit https://www.americansteeples.com/products/baptistries.
In the last several decades this concept has really started to fade and this is because the concept of portable baptistry is not recognized today by the vast majority of church leaders. The problem is that the sentence "we are all born in the same way and we all walk in the same faith" is not understood by most modern Christians. Most of them have been programmed by the so called " councils" which are nothing more than secret consulships set up by the religious right. When you start to read the Bible you will find that it has a very unusual and even contradictory ending. This is because the writers were not bakers, but fisherman and they never said anything about being born in the church and coming to be washed in the bath or being sprinkled with holy water.
So basically what you have is, according to the Bible, the church fathers and church councils of the past used words, symbols and baptismal fabrics that no longer apply today. Nowadays you do not use words like ossify, omnipotent, efficacious, omnipresent. There are no sentences like, hallowed, blessed, sanctified, sealed, turned into a white substance by the Holy Spirit, made righteous in His sight and given an extraordinary and unique life. As far as these phrases are concerned, they never applied to the early church fathers never used them either. This is because they were dealing with people who were not saved. So naturally, the language they used was based on the idea of salvation alone. Additionally, see this site to read more now.
It might be said that the sentence "I was a child of God" was a very common sentence used by church fathers and church councils of the time, but it was not in the vernacular of the people in those days. They would say things like "I am the child of God", which meant I was a special kid in a very special way. But now, it is common and the meaning has changed. But we cannot take away the use of the word "I" and we cannot deny that the Bible has used it countless times. You can gain more insightful knowledge on this topic here: https://www.britannica.com/topic/baptistery.