is lying about you being Christian a mortal sin?

[Jags]

i have a friend that lied about being Christian and his age to get on this forum
would this be a sin but he believes in jesus christ and wants to be with him would that be a mortal sin?

 

[Cimorene]

Did you talk to the friend about this 1st b4 posting this thread? Why did he lie?

 

[St. Helens]

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