Don't befriend disbelievers by leaving Muslims

O you who believe! Take not for Auliyâ' (protectors or helpers or friends) disbelievers instead of believers. Do you wish to offer Allâh a manifest proof against yourselves?

Verily, the hyprocrites will be in the lowest depths (grade) of the Fire; no helper will you find for them.

Except those who repent (from hypocrisy), do righteous good deeds, hold fast to Allâh, and purify their religion for Allâh (by worshipping none but Allâh, and do good for Allâh’s sake only, not to show off), then they will be with the believers. And Allâh will grant the believers a great reward.

An-Nisa 144-146