The author repeatedly attacks the term born-again. The fact is that Jesus used that term when speaking with Nicodemus. The Bible doesn't use the term Trinity, yet Christian churches use it all the time to describe Father, Son & Holy Spirit.
Regarding baptism. Are we commanded in scripture to be baptized? Yes. Is it required in scripture for salvation? No. The author conflates these two understandings of baptism.
"Those who believe that baptism is required for salvation are quick to use 1 Peter 3:21 as a “proof text,” because it states “baptism now saves you.” Was Peter really saying that the act of being baptized is what saves us? If he were, he would be contradicting many other passages of Scripture that clearly show people being saved (as evidenced by their receiving the Holy Spirit) prior to being baptized or without being baptized at all. A good example of someone who was saved before being baptized is Cornelius and his household in Acts 10. We know that they were saved before being baptized because they had received the Holy Spirit, which is the evidence of salvation (Romans 8:9; Ephesians 1:13; 1 John 3:24). The evidence of their salvation was the reason Peter allowed them to be baptized. Countless passages of Scripture clearly teach that salvation comes when one believes in the gospel, at which time he or she is sealed “in Christ with the Holy Spirit of promise” (Ephesians 1:13). Thankfully, though, we don’t have to guess at what Peter means in this verse because he clarifies that for us with the phrase “not the removal of dirt from the flesh, but an appeal to God for a good conscience.” While Peter is connecting baptism with salvation, it is not the act of being baptized that he is referring to (not the removal of dirt from the flesh). Being immersed in water does nothing but wash away dirt. What Peter is referring to is what baptism represents, which is what saves us (an appeal to God for a good conscience through the resurrection of Jesus Christ). In other words, Peter is simply connecting baptism with belief. It is not the getting wet part that saves but the “appeal to God for a clean conscience” which is signified by baptism, that saves us. The appeal to God always comes first. First belief and repentance, then we are baptized to publicly identify ourselves with Christ." - re: https://www.gotquestions.org/baptism-1Peter-3-21.html
“Note that the application of water is indispensable. There is no spiritual rebirth without the application of water.”
If I was the thief on the cross I’d sure be mad waking up in Hell.