Majority of Nigerians care most about their welfare than their religion.
They will vote for whoever can feed them well and protect their lives and properties regardless of religious differences.

Asiwaju Bola Ahmed Tinubu,Presidential Nominee of the national ruling party, All Progressives Congress (APC), a Muslim has chosen a fellow Muslim, the former Governor of Borno State, Kassim Shettima, as his running mate for the 2023 presidential election and many people are speaking against the Muslim-Muslim ticket.

The Christian Association of Nigeria (CAN) is not against Asiwaju Tinubu's decision, because the leadership of CAN in Borno State said they can testify to the highly laudable deeds of Shettima to uplift Christians and churches during his administration as the governor of the state.

Asiwaju Tinubu said he prioritized national growth and development above “religious sentiments” in picking Shettima.

But what have Christians gained from Muslim President Buhari and Christian Vice President Osinbajo?
Have they become richer and safer?
There have been several cases of attacks on Christians as reported by the BBC News and the Baptist Press

Are attacks on Christians in Nigeria on the rise? - BBC News
https://www.bbc.com/news/61719973

280 Christians killed in attacks in Nigeria | Baptist Press
https://www.baptistpress.com/resource-library/news/280-christians-killed-in-attacks-in-nigeria/

Christians have suffered most under this administration.

What did Christians gain from Christian President Jonathan and Muslim Vice President Sambo?

Many churches were attacked during their administration.
Islamist sects killed hundreds of Christians during the administration.
https://www.reuters.com/article/nigeria-violence-idAFL5E8FT05E20120429

What did Christians gain from Christian President Obasanjo and Muslim Vice President Atiku?

The Miss World riots were a series of religiously motivated riots in the Nigerian city of Kaduna in November 2002, claiming the lives of more than 200 people.

What matters most to majority of Nigerians is having a good government and not the religious beliefs of the President and Vice President.