[Caesar Soze]

However, given the context, we Christians will go with the Immaculate Conception.

The context of Isa 7:14 has nothing to do with the Immaculate Conception. And many Christians do not even believe in the Immaculate Conception.

[right way right]

If they do not believe in the Immaculate Conception, then what else do they not believe in?

The Resurrection?

That Jesus is the Son of God?

That believing Jesus’ testimony about himself is the way to eternal life?

Hell?

These “Christians” you refer to are not.

They belong to "their" father Satan.