Christians consider God as real.
They justify it in two ways:
1. They say that they have proof, just that other people dont understand such proof.
2. They say that there is no proof, but that they can consider God as real even without proof.
1 is obviously false, because Christians never presented any clear proof of God.
Now, lets talk about 2.
There are these options:
1. If we have no proof that X exists, then we shouldnt consider X real.
2. It is false that "If we have no proof that X exists, then we shouldnt consider X real".
Christians who think that they should consider God real even if they have no proof for God's existence, they must defend position 2, since position 2 is the negation of position 1, and position 1 is negation of Christian position.
To make it simple, they must defend that sometimes people should consider things as real without proof.
Then they must explain why position 2 works with Christian God, and not with any other God or unproven being.
But thats exactly the point.
Christians are more likely than atheists to believe in all kinds of assumptions and fictions. Christians are more likely to believe in demons, monsters, spirits, ghosts, vampires, political lies, conspiracy theories...
It seems that abandoning proof as a requirement for something to be considered real sends you onto the slippery slope of the magical world where things are considered real with no proof except pure imagination, fiction and assumption.
Of course, one can consider something as real without proof. But should one really do that?