Wow Viviane, your mind is amazing. Jesus would be heavily influenced by Judaism as he was raised under it. Bhudda was raised in a hindu culture which I fluency his words too. But when you look at what these men said there is a common thread.
- Love yourself
- Love your neighbours
- Cultivate the inner person/ mind and heart.
I don't beleive Jesus desired his followers to claim spirituality by:
- Underlining a study book
- Answering set question correctly to a paragraph
- Doing jobs at a Kingdom hall to show spiritual advancement.
As the Bhudda himself would say, "I have nothing to teach"