My view
A believer can certainly be deceived ------for example------ a Babe in Christ ---a Carnal Christian is far from Being Mature in their knowledge of the Scripture and how the enemy works ------so Satan can play havoc with that person and deceive them -----
Our job after we are saved is to know the scripture well so we can tell when we are being deceived ----- and know how our adversary works so we can win the battle of the mind -----
Satan's only job is to keep you from God and His word -----and he can only attack the mind of the believer ----and God gives clear instructions on how to defeat the enemy -----
So again it is very important to know the scriptures well ---so you don't get deceived ---and have the knowledge on how to keep your mind safe from any deception ------
It all sounds back to front if I'm being honest, how is it truly possible to believe Jesus died for your sins or believe Jesus is lord and saviour or that he rose from the grave, with out first understanding why,
For example a new babe in Christ wants to be baptised and recieve the holy spirit but has little knowledge of Christ, who he is in character or more importantly, the reason why Jesus lord and saviour had to die in the first place.
The new believer gets asked in baptism do you believe Jesus died for your sins, he just sort of says yes hoping to recieve salvation, but all tho he says he believes he has not said it with true belief.
The holy spirit would know this,
He then studies scripture and cant understand any of it so where is the belief ?.
Would it not be better to study first befor being asked if you believe.
Those are my concerns, I had knowledge befor my baptism,
My dad was always concerned about this,
One last thing there's no point in replying to me I'm leaving but I wish you well,