Ladyinred you ask the difficult questions, but I thank God for you!
You make me think.
Falling away comes from the Hebrew word apostasy, and means "to stumble, to err from the truth, to stand firm".
Christ of course is the cornerstone that causes and has caused many to stumble, one group in particular, so yes there has been a falling away.
What Christians have to do, is contend for the faith, (read Jude) seek the truth earnestly, search the scriptures diligently like Bereans and see if the things that your teachers tell you are true. Never be afraid to ask them anything, and expect an answer. Thank you .
Funny you should mention that. It is exactly what I did, and I found that many things my teachers had taught me were not true at all. I am so thankful that I realized that. I do see a huge falling away from the faith already.