Don't need to: the burden is theirs.
In the absence of any good reasons to think they may be correct, taking into account the nature of the claim and also considering that they seem to have done no due dligence in respect of the risks of mistakes or lies, then we can dismiss the resurrection of Jesus claim as being unfounded - since there are no good reasons to think it a serious proposition.
Antitheists idea of the burden of proof.
1: Get the combination of the secure nuclear proof bunker antitheist is sitting in.
2: Open the twenty ton reinforced door
3: Traverse the passage way ducking the lasers and circular saws
4: Incapacitate the ninja guards
5: Gaffer tape to stop the la la la ing
6: Force fingers out of ears
7: Make point
8:Traverse the passageway ducking etc.
9: Step out of ninja suit revealing black bowtie and tuxedo, step into car driven by soviet agent Voluptanya Voluptiouova
10 Disappear down road. Camera pans back to antitheist base and the sound of an echoey La La La.