I think they KEY phrase in your statement is 'call on HIM'. How one defines that phrase makes all the difference.
Someone wrote to me at FR once and asked 'if he/she names this Jesus as his/her savior, will the God of Jesus have his her back?' Sadly, the reason for being born again is still not understood, for someone to ask such a question. God is not a man's/woman's servant that He should 'have your back'. If this were the meaning of Salvation, God would be reduced to countering the evil, making God reactive, not Creative. God has a plan to continue His Creation through The Grace of God in Christ. 'Having your back' would halt His creating and render God an assistant. THAT is not the nature of God.
The Grace of God in Christ makes one a new creation in a 'place/way' where satan cannot destroy you and God does not have to 'have your back'. If you meet a professing Christian who is caught in a 'sin-spiral' you may conclude one of two things: either the person is not faithing (action word, daily walk) in Christ, or satan sees that one as a mighty enemy in the making and is trying to blunt the God-use of that one ahead.
Especially when you consider that the phrase came from the book of Joel.