All divine religions prohibit blasphemy and consider it a sin which cannot be forgiven.

In fact, all divine religions prohibit blasphemy and consider it a sin which cannot be forgiven. A believer should avoid even the situations which are more likely to lead to blasphemy.

The Old Testament forbids blasphemy. We read the following verse: “Do not blaspheme God or curse the ruler of your people.” (Exodus 22:28)

The New Testament tells us that blasphemy is an eternal sin which can never be forgiven. We read the following verse: “But whoever blasphemes against the Holy Spirit will never be forgiven; they are guilty of an eternal sin.” (Mark 3:29)

In Islam, even indirect blasphemy is prohibited. For example, Islam prohibits Muslims from insulting pagans lest they should insult God. In the Qur’an, we read the following verse:

And do not insult those they invoke other than Allah , lest they insult Allah in enmity without knowledge. Thus We have made pleasing to every community their deeds. Then to their Lord is their return, and He will inform them about what they used to do. (Al-An`am 6:108)

According to the Islamic scripture, God considers that the allegation that He has taken a son to Himself is blasphemy. We read the following Qudsi hadith:

“The son of Adam disbelieved Me and he had no right to do so. And he reviled Me and he had no right to do so. As for his disbelieving Me, it is his saying: ‘He will not remake me as He made me at first,’ though the initial creation [of him] is not easier for Me than remaking him. As for his reviling Me, it is his saying: ‘Allah has taken to Himself a son,’ while I am the One, the Everlasting Refuge. I begot not nor was I begotten, and there is none comparable to Me.'” (Al-Bukhari & Al-Nasa`i)

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References:

1- The Glorious Qur’an (Sahih International Translation)

2- Sahih Al-Bukhari

3- Sunan An-Nasa`i

4- The Holy Bible (Visit biblegateway.com)