Yes, God elects ... the Holy Spirit quickens the spirit ... and God has chosen to use the church to promote the Gospel. As such, we have the solemn responsibility to use wisdom in our presentation. Assessing one's culture is one method in which Christians take that responsibility seriously.
Why do you protest?
Our missionaries overseas have been doing the same for decades. One hundred years ago, missionaries went to Nigeria to make Christians who fit the mold of their home country's version of cultural Christianity. This proved to be a stumbling block, often being confused with imperialism.
Missionaries learned over time to strip away non-gospel issues from their work with indigenous peoples. Has the gospel changed? Is it so watered down that it is no longer even offensive to the non-elect? Is sin washed over? No, it is still spiritual foolishness to them without the work of God in their lives ... but the missionaries are not adding their own cultural foolishness to it.
Is it practical or appropriate even to ask Nigerians to build a building with a steeple on it in order to have church? Is it proper to require them to wear collared shirts and ties and slacks and shoes when they attend the weekly meetings in the steepled building? Should we set an organ up front and provide Isaac Watts hymnals for everyone?
Are these wrong? No, not for a culture in which they are appropriate.
But for Nigerian believers, these things are unnecessary for gospel promotion.
By allowing Nigerians to wear their native garb, sing praises to God in their native tongue to their native music, meet under a tree or in a home, one is not adjusting the gospel to fit culture.
You are not telling the people "Ah, I understand that animal sacrifice is a part of your culture. Please, continue... You pray to your ancestors? Well, that's fine... You practice homosexuality because that's who you are? No problem."
The Roman Catholic church was notorious for such assimilation of culture into the Gospel ... especially in South America. "This is a legend you have ... well, see, Jesus' mother is sort of like the mother of this god you worship. Just change the names of your gods and it's essentially the same thing."
Or is Christianity the white man's religion?
If we assess culture overseas as missionaries, why then are people wary of doing the same within our own country?
Is the church not to be a missionary in its own community?
Are there areas in the church that are non-gospel issues that the church is clinging to but prove to be merely cultural stumbling blocks to their community truly understanding the Gospel?
Are the people they are trying to reach equating some methods with moralism or "imperialism"?