Remarriage of Widows in Christianity

Christianity doesn't encourage the remarriage of a widow or a widowed, it discourages remarriage overlooking the biological need that God planted in the human being; how many young women and young men who lost their spouses for many reasons( wars, epidemics, diseases, murder…etc).  And moreover, how dire the need for children from one's lineage to support him or her when they grow old. I wonder why the  fathers of the early Church  didn't think about increasing the number of the believers by encouraging the believers widows to remarry.

Think about a young woman or a young man in the age of fifteen or sixteen who lost his or her spouse for any reason, how he or she can remain without spouse till an old age. It is also something that can't be imagined that whoever remarries should be punished by depriving him from the spiritual rights and ranking him with the non-righteous people, as will be shown

Please note that Jesus never issued such decrees regarding the remarriage of the widows, it is human adulterations that made change in the divine enactments.

Saint Paul says:

For I would that all men were even as I myself. But every man hath his proper gift of God, one after this manner, and another after that.

• say therefore to the unmarried and widows, It is good for them if they abide even as I.
• But if they cannot contain, let them marry : for it is better to marry than to burn.
• And unto the married  command , yet not I, but the Lord, Let not the wife depart from her husband:

 In another place (Verses 39-40 he stressed his point of view which would later be stressed by the early fathers of the church:

Verses 39-40read,

“A wife is bound by law as long as her husband lives; but if her husband dies, she is at liberty to be married to whom she wishes, only in the Lord. But she is happier if she remains as she is, according to my judgment–and I think I also have the Spirit of God.” (NKJV)

What about if the widow is still young,  in the biblical times women were married so young, Mary the mother of Jesus gave birth to Jesus while she still fourteen, she was betrothed to an old man(90 years old) before that. Taken into consideration the wars and the epidemic, there must have been a lot of widows whom Paul says to them:

"…But she is happier if she remains as she is,"

However Paul, as affirmed by many, wasn't a prophet sent by God to enact, I would ask what if what Paul said is applied nowadays? How many widows will be there in the corrupted world, what would they do to financially support themselves.