@BuffyLou the question that I have for you is, who taught all the people of many religions beside Judaism, over all islands and continents, to do sacrifices, that blood is required to wash sins? Who taught them this?
All people from the dawn of time knew in their hearts that every sin goes against the law of life, and that wages for sin is death, and they were convicted in their hearts, and they made sacrifices and offerings, trying to reconcile themselves with Heaven. Sometimes the ways they did this was quite warped, which depended on the nation and its depravity level.
The Creator took one of these peoples and gave them commandments about specific animal sacrifices that would describe the law of life prophetically, and that would be a shadow of His salvation to come, in their time, when the world is ready. People over the world might not do these things anymore because the cultures changed, but people still try to redeem themselves through offerings like charity in order to have blessings in their life, or they just suffer through guilt for the things they did wrong, but there are always doubts. The difference between a Christian and the world is that we have relationship with Life itself, and if we do charity, we do it out of free will with the same Spirit of love that reached out to mankind with forgiveness and salvation, not out of guilt.