Can he give voluntary charity to people who follow bid’ah?

No File Exists
Check below answers in case you are looking for other related questions:
Is it permissible to give zakaah to a poor girl to cover the expenses of her wedding?
Can zakaah be given to one who will build a house with it?

No File Exists
Related Answers:
He sponsored an orphan; can he give him zakaah?
Is giving zakaah to those whose hearts are to be opened to Islam a kind of bribe?
Who are the debtors to whom zakaah may be given?
Is it permissible to give zakaah to a poor girl to cover the expenses of her wedding?
Can zakaah be given to one who will build a house with it?

Recommended answers for you:
Jumu’ah prayer is not obligatory for women
Ruling on dealing with mortgages in a non-Muslim country
Rulings on miscarried foetus
What is the true meaning of shirk and what are its types?
The ideal way to send blessings upon the Prophet (blessings and peace of Allah be upon him