Milarepa
...His mother, bitter, sent Milarepa to train in black magic, to wreak revenge on those who had blighted her life...
Then later in life he came to meet his teacher Marpa the translator
...he came to regret his actions, and looked for help in shedding the bad karma he had acquired during his vengeful adolescence...
Tilopa
He practiced this teaching at Somapuri, but when the monastery saw him take a female consort for the practice of union yoga, he was forced to quit the community.
Tilopa profited from his expulsion by travelling throughout India, searching out many teachers and learning their methods.
Naropa
Several years later, at twenty-eight, his interests drew him to Nalanda University, near Pullahari, famous for its Buddhist philosophers...But then a dakini appeared to him, telling him that meditation practice was more important than philosophizing, and that he should search out a certain Tilopa for instructions.Leaving the monastery...
This is an entire lineage Tilopa->Naropa->Marpa->Milarepa
As they say :The truly enlightened are not necessarily very religious. Religon is a convienent description to take care of our fears, to passify us.