You must continue to believe to the very end to be saved when Jesus comes back.
Here is another problem, to make me believe that a truly saved secure Christians will be turned away when Christ returns. I need to borrow your words this time that “I lough at myself” why? Because it is always you that says “ YOU must continue to believe…to be saved” but it’s Christ, Jesus said to anyone “He that believeth on ME…” It is Christ who saves, It is the gospel that we are saved, and the security lies in the sealing of the Spirit, in the hands of the Saviour, in the hands of the Father and in the promises of the Bible that continues to hold to. I bet, he continues to work on me until the very end because I am saved.