"Now I plead with you, brethren, by the name of our Lord Jesus Christ, that you all speak the same thing, and that there be no divisions among you, but that you be perfectly joined together in the same mind and in the same judgment." (1 Corinthians 1:10)
This was written to the Corinthians who had major sin problems; yet, God expected even them to become able to "speak the same thing" . . . which is possible with God, and if He commands this He knows this is a realistic expectation to have for us. And He is so able to make us "perfectly joined together".
But if I am doing well in a church which is part of a denomination, I can be perfectly joined to any others who are God's way.
I think of a few things >
It is clear how we Jesus people are "members of one another" (Romans 12:5, Ephesians 4:25). And we minister to each other, using our gifts > 1 Peter 4:9-10. So, it is not good to have nearby churches with their people away from each other so they are not ministering their gifts to each other.
Also, if we have a number of different buildings . . . this can take up money to maintain more buildings than needed for the Christians in a certain area. And there are various groups who have become small in large and old buildings which they have to pay to take care of.
And there can be a big expense for heating meeting spaces which have high ceilings where the heat can accumulate up where people do not even get it; and that costs a bit to pay for the fuel.
And the members who are especially qualified to care for buildings might be spread out in different churches so that certain places might not get the benefit of their abilities.
So, God in the Bible says we need to be good stewards.
But people can get into preferences for ideas and who is preaching in their churches. And Paul, after he says to speak the same thing, then says how the Corinthians were picking favorite ministers. So, the divisions might not be an issue mainly about ideas, but what is maybe especially wrong is to follow a favorite minister and exalt that person over others. Then can come comparison of people, instead of dealing with how we are in comparison with Jesus.
"For we dare not class ourselves or compare ourselves with those who commend themselves. But they, measuring themselves by themselves, and comparing themselves with themselves, are not wise." (2 Corinthians 10:12)
So, again, I consider that divisions that make a big deal out of some one person over others is a bigger problem than having different ideas.
"nor as being lords over those entrusted to you, but being examples to the flock." (1 Peter 5:3)
So, I would say make sure a church knows what they are doing with their money and property and they have people who are taking care of those things. And help them, but be careful about letting yourself become the only one who is helping.
And do not get tangled in worldly church people's stuff > 2 Timothy 2:4. But keep free to make sure with God and go with how He leads you. I understand a Christian group will welcome you to keep testing with God about what He wants > after all, we grow and mature, then discover what our Father has us doing; so I do not think it is smart for you as a young Christian to make commits now for who you will become as a mature person later