Scripture does not give a rule
The Bible calls God's people to honour him, but it does not set rules for English capital letters. Paul says that all Scripture is given by God's inspiration and is useful for shaping believers, as 2 Timothy 3:16 teaches. That tells us Scripture carries God's authority. It doesn't mean every later choice made by English editors has the same authority.
So the question is not whether God deserves honour. He does. The question is whether capitalising a pronoun is the required way to show that honour. The Bible never says that it is.
All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
The original languages worked differently
The Old Testament was mainly written in Hebrew, a language whose ancient writing did not distinguish upper-case from lower-case letters. The New Testament was written in Greek. Early Greek manuscripts were commonly copied in large, continuous letters, without the modern capitalisation and punctuation systems readers expect today.
That means a capital H in “He” cannot come directly from the Hebrew or Greek text. It is an English publishing decision. Translators and editors must make many such decisions so that readers can understand the text clearly.
Why Bibles and Christians differ
Some modern Bible translations capitalise divine pronouns to help readers notice when a pronoun refers to God, Christ, or the Holy Spirit. Others leave them in lower case because English grammar normally reserves capitals for names and titles. Both approaches aim to serve readers, not to lessen God's glory.
The KJV capitalises divine names and titles such as God, LORD, and Lord, but generally uses lower-case pronouns for God. Its familiar wording therefore shows that reverence for God does not depend on capitalising every pronoun.
Write with reverence and freedom
If you choose to write “He” and “His” for God, that can be a thoughtful personal habit. If you use ordinary lower-case grammar, you have not dishonoured God. God sees the heart, and Jesus warned against honour that remains only on the lips while the heart is far away, as Mark 7:6 explains.
Try not to turn a style choice into a way of measuring another Christian's devotion. Romans 14:4 reminds believers that each servant stands before their own Master. Read the passage carefully, honour God's name, and let the meaning of Scripture receive the attention it deserves.
Who art thou that judgest another man's servant? to his own master he standeth or falleth. Yea, he shall be holden up: for God is able to make him stand.