Baptism

No, you don't need to be baptized to be a follower of God but a member of the church you do need to be baptized and their are a lot of people that have baptized kids that don't believe in God. 

I don't believe you need to be baptized, or even be a Christian to honor God and be a good person. By being a good person, you are honoring God whether you know it or not. If your dad is a good person he's fine lol

The sacraments are based on scripture. Contrary to popular belief, you must be baptized. If you're wondering about the thief on the cross, that is called Baptism by Blood, it is a really rare case (an exception) and a show of God's immense grace. But that does not mean we should all exploit the exception, Christ still tells us to be reborn in Water and Spirit. If you would like to know more, there are tons of Catholic resources online for you to read, God bless you my friend

"The Lord himself affirms that Baptism is necessary for salvation.⁵⁹ He also commands his disciples to proclaim the Gospel to all nations and to baptize them.⁶⁰
Baptism is necessary for salvation for those to whom the Gospel has
been proclaimed and who have had the possibility of asking for this
sacrament.⁶¹
The Church does not know of any means other than Baptism that assures
entry into eternal beatitude; this is why she takes care not to neglect
the mission she has received from the Lord to see that all who can be
baptized are 'reborn of water and the Spirit.' God has bound salvation
to the sacrament of Baptism, but he himself is not bound by his
sacraments."

This is from The Catechism, paragraph 1262. Here is a link to read more about the necessity of baptism: https://www.vatican.va/content/catechism/en/part_two/section_two/chapter_one/article_1/vi_the_necessity_of_baptism.html

You are right to be worried for your father, but be warned that converting someone, especially your own family "But Jesus said to them: A prophet is not without honour, save in his own country, and in his own house. And he wrought not many miracles there, because of their unbelief," (Mathew 13:57-58) is not typically a matter of preaching. Rather the way you convert others is through example. If you are yourself a saint you will convert many, even without strong arguments, but even if you are the greatest philosopher in history, but have no faith, you will not save a soul.

The best thing you can do for him is pray for him and live out your own life to the perfect standard God has called us to. Do what you can to receive the sacrament and to learn about Jesus Christ and his body on earth, his Church. (Sorry for necroposting, didn't realize how old this was.)