When I first became a Christian in the 1980's it was a fairly simple proposition:
"Believe in the Lord Jesus Christ and you will be saved."
But since then Christianity has become more complex.
First it was "you need to be pentecostal to be a proper Christian" then "you need to be a creationist to be bona fide" then "you need to be into the Toronto blessing to be genuine" then "you need to be a premillenialist and believe in biblical prophecy that the second coming will be soon" and more recently "you need to accept that God has a special purpose for Israel".
What happened to the simple gospel?
Everything has become far too complicated and much too difficult for most people to accept.
This might be one reason why the Church is struggling.
For many people, including myself, It has become a little bit like swallowing a gnat while straining on a camel.