Why do Christians think that we must be many to win great victories?
You can read the account of Gideon´s ministry in the Book of Judges chapter 6 and onwards.
Gideon raised up an army of 32.000, but God said: «The people are too many». The Midianittes were countless. But God said NO. God needed only a few.
22.000 were fearful and worried, and were sent home.
Now there were 10.000 left. Were they still too many? Now the Lord sent home 9.700 who did not follow the instructions.
With 300, Gideon won the victory.