This existence of ours is as transient as autumn clouds To watch the birth and death of beings is like looking at the movements of a dance. A lifetime is like a flash of lightning in the sky, Rushing by, like a torrent down a steep mountain.
There are techniques of Buddhism, such as meditation, that anyone can adopt. And, of course, there are Christian monks and nuns who already use Buddhist methods in order to develop their devotion, compassion, and ability to forgive.
When a wise man is advised of his errors, he will reflect on and improve his conduct. When his misconduct is pointed out, a foolish man will not only disregard the advice but rather repeat the same error.
The Buddha taught some people the teachings of duality that help them avoid sin and acquire spiritual merit. To others he taught non-duality, that some find profoundly frightening.
A priest once quoted to me the Roman saying that a religion is dead when the priests laugh at each other across the altar. I always laugh at the altar, be it Christian, Hindu, or Buddhist, because real religion is the transformation of anxiety into laughter.
Whether you believe in God or not does not matter much, whether you believe in Buddha or not does not matter so much; as a Buddhist, whether you believe in reincarnation or not does not matter so much. You must lead a good life.