سم الله الرحمن الرحيم
One of my kin has proposed to my daughter and I am under an obligation to him, but he is addicted to alcohol and he keeps company with bad people and prays little, or does not pray at all. He is also addicted to watching videos and television and other time-wasting devices and I am in difficulty regarding him. I request clarification of the ruling of Islām in the matter.
A- If the person proposing to your daughter is as you have described him, then it is not permissible for you to give her in marriage to him, because she is a trust in your hands. So, it is incumbent upon you to choose for her the most righteous man in his religion and his character.
It is not permissible for a person who does not pray to be married to a Muslim woman who does pray, since he is not a suitable match for her, because abandoning prayer is an act of major disbelief, according to the saying of the Prophet ﷺ:
“بَيْنَ الرَّجُلِ وَبَيْنَ الشِّرْكِ وَالْكُفْرِ تَرْكُ الصَّلَاةِ”
“Between a man and polytheism & disbelief is leaving the prayer.” 
And the saying of the Prophet ﷺ:
“الْعَهْدَ الَّذِي بَيْنَنَا وَبَيْنَهُمُ الصَّلَاةُ، فَمَنْ تَرَكَهَا فَقَدْ كَفَرَ”
“The covenant which is between us and them is the prayer; so whoever abandons it, has disbelieved.” 
Narrated by Imām Aḥmad and the compilers of the Sunan with an authentic chain of narrators.
There are many other evidences in the Book (of Allāh) and the Sunnah which prove the disbelief of one who abandons prayer, even if he does not reject its obligation, according to the most correct of two opinions held by the scholars. However, if he rejects its obligation or mocks it, then he is guilty of major disbelief according to the consensus of the Muslims.
As for one who drinks alcohol but prays, he is not guilty of disbelief by doing this, as long as he does not claim that it is permissible, but he has committed a major sin and he has gone astray thereby. Therefore, it is lawful for you to not give her in marriage to him, even if he prays, due to his sin and because he might lead his wife and children to this great crime.
We ask Allāh to improve the situation of the Muslims and guide them to His Straight Path, and to preserve us and them from obeying vain desires and shayṭān, for verily, He (Allāh) is Most Generous, Most Noble.
[Sheikh Ibn Bāz, Fatāwā Islāmiyah 5/173-4]________________________1) Ṣaḥīḥ Muslim 822) Jāmiʿ At-Tirmiḏī 2621