Look into the old SDA claims about Ellen G. White and you’ll know everything about SDA you need to know.
http://www.formeradventist.com/
The SDA is a sect founded in the 19th century. That’s more than 1800 years AFTER Jesus established His Church. What else does someone really need to know?
When Paul preached to the Gentiles, they were founding new churches sometimes decades after Christ, and what Paul taught wasn't what Christ taught.
So if a modern day Paul were to teach the same things the original Paul taught with the same results, then would those new churches be discounted by you since they came about 2000 years after Christ?
**That’s more than 1800 years AFTER Jesus established His Church. What else does someone really need to know? **
Right on!
The one, holy, Catholic and apostolic Church. The first Church!