The greatest achievement is selflessness.
The greatest quality is seeking to serve others.
The greatest goodness is a peaceful mind.
The greatest patience is humility.
Conquer the angry man by love.
Conquer the ill-natured man by goodness.
Conquer the miser with generosity.
Conquer the liar with truth.
Thousands of candles can be lit from a single candle,
and the life of the candle will not be shortened.
Happiness never decreases by being shared.
I fail to see how something like that would close a church. Aren’t those pretty much in keeping with Christian ideals? If someone quoted them but didn’t say they were Buddhist, I doubt any Christian would have a problem with them.
Understood in a completely Christian context, that particular passage seems fairly harmless, that I will agree with. It isn't in open contradiction with Scripture (though I might say that the highest quality is seeking to serve God; serving others flows from serving God).
But that still doesn't mean that it should be read from the pulpit in a Christian Church in a manner that makes it seem equal to Scripture - because it isn't Scripture. There is plenty of beautiful poetry and beautiful wisdom in the writings of the Old and New Testaments.