How do you know that they haven't achieved quality?
What do think was the quantity of Christians in the first centuries?
“Most scholars of Christian origins tend to exaggerate the size and importance of the early Christian church. This is understandable in the light of the discipline’s intense concentration on the New Testament texts. By confining ourselves in particular to the letters of Paul, the Gospels and Acts, it is all too easy to create a limited and false impression of the ancient world and the place of the Christians within it.
Yet the reality is that for all of the first century the Christians were a tiny and insignificant socio-religious movement within the Graeco-Roman world (Hopkins 1998:195-196). Christianity did of course grow considerably in later centuries and it eventually became the religion of the Roman empire, but we should take care not to retroject its later size and importance into the initial decades of its existence.
“Just how small was the Christian movement in the first century is clear from the calculations of the sociologist R Stark (1996:5-7; so too Hopkins 1998:192-193).Stark begins his analysis with a rough estimation of six million Christians in the Roman Empire (or about ten percent of the total population) at the start of the fourth century... There were 1,000 Christians in the year 40, 1,400 Christians in 50, 1,960 Christians in 60, 2,744 Christians in 70, 3,842 Christians in 80, 5,378 Christians in 90 and 7,530 Christians at the end of the first century.
These figures are very suggestive, and reinforce the point that in its initial decades the Christian movement represented a tiny fraction of the ancient world.”
How many Jews became Christians in the first century?
That is true, but this will change over time. The Baha'i Faith will grow over time just as Christianity grew over time.
Because this is an interconnected, instant communication world, the message of Baha’u’llah has spread 664 times as fast as Christianity during the first century. At the end of the first century there were only 7,530 Christians whereas at the end of the first century there were five million Baha’is.
In the heroic age of the Baha’i Faith before we had mass communications or the internet the Baha’i Faith grew a lot faster than it is growing now, and that can be explained by the human element, the willingness of the Baha’is to make the necessary sacrifices to see the Faith grow.
Statistics show that from 1910-2010, the Baha’i Faith grew at a rate of 3.54%, whereas during that time Islam grew at a rate of 1.97% and Christianity grew at a rate of 1.32%.
From 2000-2010 Islam became the fastest growing religion (1.86 %) and the Baha’i Faith was the second fastest growing religion (1.72%).
Statistics from:
Growth of religion
The growth rates of the Baha’i Faith were higher than Islam from 1910 to 2010 because it includes the “formative age” of the Baha’i Faith (1921-1944)
FOURTH PERIOD: THE INCEPTION OF THE FORMATIVE AGE OF THE BAHÁ’Í FAITH 1921–1944
The goal of the Baha’i Faith administration has not always been to increase numbers of adherents but rather to expand to as many locations as possible around the world. These goals have been met. The Baha’i Faith has spread to over 250 countries and territories and is almost as widespread as Christianity. Most of this happened during the “formative age” of the Baha’i Faith (1921-1944).
Growth of the Baha’i Faith has slowed down since 2000 because the new goal is consolidation and community building, so the emphasis is not spreading the Faith all over the world as it was before in the 20th century.
We are only at the very beginning of the "messianic age."
Some of the prophecies are in the process of being fulfilled, and if you want to throw out a few of those prophecies I can explain how they are being fulfilled.