Peter and the people at Pentecost and all of the others who responded to the Gospel message would disagree with you.
[Roman] Catholic calls for repentance (in the Bible, early Christian era, Medieval Christian era, modern times) use some of the same language but are not an appeal to easy belief nor Once Saved Always Saved nor anything else that Protestant.
I'm not aware of a call to "an easy belief" in my church. I've never held the view that you just say, "I believe" and that's it. I've understood once you decide to believe in Him...you believed in Him and followed Him.You do what He says.
Regarding the security of your salvation.
13In Him, you also, after listening to the message of truth, the gospel of your salvation—having also believed, you were sealed in Him with the Holy Spirit of promise, 14who is given as a pledge of our inheritance, with a view to the redemption of God’s own possession, to the praise of His glory. Ephesians 1:13-14 NASB
“Peter and the people at Pentecost and all of the others who responded to the Gospel message would disagree with you.”
Not in the slightest.
1) You’ll keep saying it even though we all know the “Altar Call” is a modern Protestant invention.
2) So what you’ll do is you’ll keep insisting that something that didn’t exist actually did so - even though you have no proof whatsoever.
3) You’ll claim - falsely - that the preaching of the Apostles was the same thing as an “Altar Call” even though it wasn’t and there are Protestants who admit it wasn’t.
4) You’ll try to draw parallels to the ancient Catholic practice of preaching in the New Testament and the completely modern invention of the “Altar Call” as if that makes them one in the same - which it doesn’t because of the complete, total absence of latter-day Protestant doctrines like OSAS.