Being born again is overrated. Better to grow up.
Have a look at what an intelligent Bishop has to say on that as well as a mythologist.
https://www.youtube.com/watch?v=SF6I5VSZVqc
https://www.youtube.com/watch?v=aGx4IlppSgU
Constantine killing his child should not be a big deal to Christians.
God himself murdered Adam and Eve through neglect and locking away what would keep them alive. The tree of life.
If killing your children is ok for God then it must be ok for us as we are to emulate him in all ways.
Regards
DL