Is it sin to attend a catholic baptism?

[Bruthon1]

God led me out of the catholic church and from their false teaching 4 to 5 years ago. However, much of my family is still caught up in that system. Knowing of my departure from the catholic church they still want me to attend one of their baptisms in a catholic church.

What do you guys think? Would this be sin, even if I know in my heart this has heresy written all over it?

 

[Squire Robertsson]

I wouldn't as it would look like I supported the rite. However, if you could think of a way to celebrate the event without stepping foot in Our Lady of... do so.