Well I don't think it is scriptural for as being a must that a man and a woman should get engaged before being baptized. I think baptism only needs spiritual requirements, which is an instruction from our lord Jesus. I keep wondering what kind of church will set that as requirement for baptism.
I understand that many churches now has come out with different doctrines and laws intimating their members of those things that are not really scriptural. And sometimes I wonder why people keep listening to this doctrine of theirs.
Most churches have turn the scripture to suit their own personal requirements and greed. That's why it is necessary that one listen only to the true doctrine from the true church of God and spoken through the servant of God. The servant of God has made better teaching on this, therefore you don't have to miss out, if you are still curious about knowing more on this, please watch the video up there.