Your friend does not pray! When you go to the mosque, give him a call too, remind him of his Lord.
If he smokes, takes other intoxicating substances, remind him that it is haram. They create distance between God and him, and increase his distance with society and people.
He watches porn videos, talks about them in your circle very funny. Tell him that obscenity is forbidden. And the society that spreads obscenity is cursed by God.
He is flirting with some girl, stop him. Say it is haram, destroys society.
He is blaspheming, tell him it is haram. Like eating the flesh of your dead brother.
She is wearing revealing clothes, not veiling. Explain to him in a soft tone that it pollutes the society, spreads bad smell, remind him that veil is obligatory on him. Explain the impact of this small contribution to the spread of obscenity in society and remind the creator of the curse.
She considers tight and low-cut or half-naked clothing as choice, freedom, modernity. Explain to him that it is wrong thinking, corrupt and wrong opinion. Tell him that the standard of Muslim thought is not the ideology of the West, but the thought of Muslims is Al-Quran.
You are a Muslim, your Lord has sent you here to lead the world. He sent people to know good and evil. Lead as much as you can. Call people to good, forbid evil, obscenity and evil.
2085.717 SRY